Right click on the Citrix Receiver icon
Click/Select Connection Center & click on Preferences
Select File Access & Select Read & Write option
Click OK
Friday, 27 July 2018
Real time issue which Citrix Engineers are facing
In nearly all cases, using the Native client is recommended over the Java client. See the section Changing the client for instructions.
To check/change the current client, click on the Advanced Options link on the login screen. Under “Remote client type”,the Native client should be currently selected.
Many issues are resolved by confirming that the local computer’s system clock is correct, deleting temporary internet files, and/or uninstalling then reinstalling the Citrix client. The Beyond site should be added to the Trusted Sites list in IE ﴾see below﴿.
Note that connecting to a user’s computer via a Webex support session installs a WebEx Document Loader virtual printer on that computer and sets it as the default printer
Client installation issues:
The wrong client software has been installed:
Opening Citrix causes a window to open asking “What is the address of the server hosting your published resources.”
There is a space to fill in the server name. The sample answer is https://servername
Uninstall and reinstall the Citrix client. Only the web plugin component should be installed
Issues While login to Citrix Page:
Error messages to do with ‘invalid credentials’
This error is typically caused by an incorrectly typed password, PIN, or keyfob number; a domain password out of sync with the Novell password; or a keyfob in next tokencode mode.
Client software not detected:
Before the user authenticates at the Citrix login page, the following warning is displayed in the Message Center:
We are unable to detect the appropriate client software on your computer to allow you to launch your applications.Click here to obtain the client software
If the IE yellow warning bar is visible, click on it to install the Citrix Helper Control ﴾an Active X control﴿. Otherwise, if the software has been installed, click on the “Click here to obtain the client software” link, then click on either the Allow button or yellow bar to install the Citrix Helper Control, or click on the “Already Installed” link.
Adding the Beyond site to the Trusted Sites list in IE should allow the Active X control to run without prompting ﴾see below﴿.
Issues after successfully authenticating at the Citrix login web page:
IE Trusted Sites
The user is able to authenticate at the Citrix login page and the applications are available, but the user sees the following warning in the Message Center:
Current browser security restrictions may prevent you from launching applications, or may require your explicit permission to proceed. To launch an application successfully, save the launch file if prompted and double‐click the file to start the application.
This message appears only in Internet Explorer. Firefox and Chrome do not produce the warning. If the user is able to connect to the applications, the message can be ignored.
If the user is unable to connect, the resolution is to add the site to the Trusted Sites list in Internet Explorer:
In Internet Explorer, navigate to https://.com
Click Tools ‐> Internet Options ‐> Security tab.
Click the Trusted Sites checkmark icon, then click the Sites button.
Confirm that the URL https://.com appears in the top box, and click the Add button. Click Close and OK to return to the login screen.
Log in.
Client software not detected:
The user is able to authenticate at the Citrix login page. Instead of a page displaying the available applications, the user sees a page displaying with the following warning:
Download Client Software
We are unable to detect the appropriate client software on your computer to allow you to launch your applications.If you wish to download and deploy the client software to allow you to launch your applications, click Download.
If the IE yellow warning bar is visible, click on it to install the Citrix Helper Control ﴾an Active X control﴿. Otherwise, click on the ‘Already Installed’ link under Troubleshooting Options at the right‐hand side of the page.
Temporary internet files
The user is prompted to save the launch.ica file. If the user saves the file and double‐clicks it, Citrix opens but then displays an error:
The Citrix SSL server is not accepting connections.
Try clearing the browser’s temporary internet files. If this doesn’t resolve the issue, follow the instructions for adding the site to IE’s Trusted Sites, above. ﴾Strangely, the resolution in a few tickets is to reboot the router.﴿
Client installation
The user is able to authenticate at the Citrix login page. After clicking on an application, the user receives the error:
Connecting through Citrix secured gateway. Error reading from proxy server.
Uninstall and reinstall the Citrix client. Only the web plugin component should be installed
Session re-connection:
The user is able to authenticate at the Citrix login page. After clicking on an application, the user receives the error:
There are no existing applications available for re-connection.
This is simply an informational message stating there are no pre‐existing apps to reconnect to. It can be ignored if the user is not having an issue launching applications.
MSLicensing registry key
The user is able to authenticate at the Citrix login page. After clicking on an application, the user receives one of the following errors:
There is no route to the specified subnet address.
or
The Citrix MetaFrame server is not available. Please try again later.
To resolve, delete the MSLicensing registry key.
Click on the Start button, select Run and type in “regedit”.
Click OK.
The registry editor window will open.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing.
Click once on MSLicensing so it is highlighted and then hit the Delete key.
Close the registry editor and attempt to login to Citrix.
Connecting to the wrong application
The user receives the following error message in Citrix after entering a username and password at the Client window:
The system could not log you into the network.
Make sure your name and connection information are correct, then type your password again.
The user is likely trying to connect to the wrong application. For example, a Chicago user may have clicked on the DC Desktop application.
Issues after successfully authenticating at the Client window
Reconnecting to a session
The user receives the following error message in Citrix after successfully authenticating at the Novell Client window:
Connection error: You have not been granted access to this published application
This issue can be resolved by a Citrix administrator. It may be due to an issue with a prior ‘disconnected’ session not connecting correctly. The administrator can reset the session.
Printer unavailable issues
The user cannot find the local printer in the list of available printers.
Disconnect from Citrix, set the local printer to be the default printer, confirm that the Native Client is the selected Citrix client under Advance Options, and reconnect to Citrix. If the printer is still missing, uninstall and reinstall the Citrix client.
Printer offline issues
While connected to Citrix, the user receives periodic messages having to do with ‘a network printer is offline’.Check the physical printer. It is likely jammed or out of paper. It may also be that the printer is set to accept only certain paper types or sizes.
Confirm that the printer driver in Citrix is correct for that model printer.
Print jobs are not processed
In Citrix, a single print spooler is shared by all connections. A large print job can delay all other jobs, or a stuck job may prevent any other jobs from being processed. After ruling out other causes, contact the Citrix administrator to resolve.
MacPac
The user receives various errors when using MacPac.
If the user’s H: drive user folder is missing a \MacPac\Personal\ folder, copy yours to the user’s folder.
Lag :
Latency is the primary cause of poor performance in Citrix. Latency can be roughly measured by pinging the URL of the login server. Latency greater than 100ms will result in lag and other problems. An example of lag is when the user types in a Word document but the text doesn’t appear on the screen for a few moments, then catches up all at once.
Citrix window not responding
Shortly ﴾and sometimes immediately﴿ after authenticating at the Novell Client window, the Citrix window will stop responding.
The fix is to give the user full rights to the MSLicensing key.
Open Regedit and navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing
Right‐click on the MSLicensing key and select Permissions.
Under the Security tab, click on Users to highlight it.
Check the box in the Allow column next to Full Control.
Click OK and close Regedit.
Accessing the local machine’s hard drive:
Once in Citrix, right‐click on the Start button in the Citrix environment and select Explore.
Browse the list of drives in the left‐hand pane and locate “C$ on ‘Client’ ﴾C:﴿“. This is the local workstation’s C: drive.Click on the drive to open it.
How to allow Citrix access to the local machine’s hard drive and USB devices (including printers)
The first time you connect to Citrix, you’ll be shown a ICA Client File Security setting window where you can choose what access to your local machine you wish to grant to Citrix. You are also able to choose to “Never ask me again”.If you need to later change these settings, follow the appropriate steps below ﴾try the ‘newer clients’ step first﴿.
Newer clients:
While connected to Citrix, double‐click on the Citrix Connection Center icon in the system tray of the local machine. Click on the Security icon to configure the Session Security options for Files, Microphones/Webcams, PDA Devices, and USB/Other Devices.
Older clients:
Disconnect from Citrix. On the local machine, delete the webica.ini file under C:\Documents and Settings\[username]\Application Data\ICAClient. When you next reconnect to Citrix, you’ll be shown the ICA Client File Security setting window again.
Citrix Program Neighborhood
How to minimize the Citrix window to view the local machine’s desktop.
Shift+F2
SSL Errors:
SSL error 61 (the server certificate received is not trusted)
Run Windows Updates and update the root certificates.
SSL error 68 (the SSL certificate is not yet valid)
Set the local system clock to the current date and time.
SSL error 70 (the SSL certificate is no longer valid)
Set the local system clock to the current date and time.
SSL/TLS error: The certificate validation failed.
Confirm that the Native client, not the Java client, is in use by clicking on the Advanced Options link on the login screen.
http://support.citrix.com/article/CTX125056
To check/change the current client, click on the Advanced Options link on the login screen. Under “Remote client type”,the Native client should be currently selected.
Many issues are resolved by confirming that the local computer’s system clock is correct, deleting temporary internet files, and/or uninstalling then reinstalling the Citrix client. The Beyond site should be added to the Trusted Sites list in IE ﴾see below﴿.
Note that connecting to a user’s computer via a Webex support session installs a WebEx Document Loader virtual printer on that computer and sets it as the default printer
Client installation issues:
1) Uninstall existing Citrix
plug-in/receiver.
2) Please download the Citrix
Receiver clean-up utility from https://support.citrix.com/article/CTX137494
3) After downloading it, run
ReceiverCleanupUtility.exe.
4) After it gets completed,
reboot your machine once.
5) Download latest version of
Citrix receiver using below URL and install it in the system.
The wrong client software has been installed:
Opening Citrix causes a window to open asking “What is the address of the server hosting your published resources.”
There is a space to fill in the server name. The sample answer is https://servername
Uninstall and reinstall the Citrix client. Only the web plugin component should be installed
Issues While login to Citrix Page:
Error messages to do with ‘invalid credentials’
This error is typically caused by an incorrectly typed password, PIN, or keyfob number; a domain password out of sync with the Novell password; or a keyfob in next tokencode mode.
Client software not detected:
Before the user authenticates at the Citrix login page, the following warning is displayed in the Message Center:
We are unable to detect the appropriate client software on your computer to allow you to launch your applications.Click here to obtain the client software
If the IE yellow warning bar is visible, click on it to install the Citrix Helper Control ﴾an Active X control﴿. Otherwise, if the software has been installed, click on the “Click here to obtain the client software” link, then click on either the Allow button or yellow bar to install the Citrix Helper Control, or click on the “Already Installed” link.
Adding the Beyond site to the Trusted Sites list in IE should allow the Active X control to run without prompting ﴾see below﴿.
Issues after successfully authenticating at the Citrix login web page:
IE Trusted Sites
The user is able to authenticate at the Citrix login page and the applications are available, but the user sees the following warning in the Message Center:
Current browser security restrictions may prevent you from launching applications, or may require your explicit permission to proceed. To launch an application successfully, save the launch file if prompted and double‐click the file to start the application.
This message appears only in Internet Explorer. Firefox and Chrome do not produce the warning. If the user is able to connect to the applications, the message can be ignored.
If the user is unable to connect, the resolution is to add the site to the Trusted Sites list in Internet Explorer:
In Internet Explorer, navigate to https://.com
Click Tools ‐> Internet Options ‐> Security tab.
Click the Trusted Sites checkmark icon, then click the Sites button.
Confirm that the URL https://.com appears in the top box, and click the Add button. Click Close and OK to return to the login screen.
Log in.
Client software not detected:
The user is able to authenticate at the Citrix login page. Instead of a page displaying the available applications, the user sees a page displaying with the following warning:
Download Client Software
We are unable to detect the appropriate client software on your computer to allow you to launch your applications.If you wish to download and deploy the client software to allow you to launch your applications, click Download.
If the IE yellow warning bar is visible, click on it to install the Citrix Helper Control ﴾an Active X control﴿. Otherwise, click on the ‘Already Installed’ link under Troubleshooting Options at the right‐hand side of the page.
Temporary internet files
The user is prompted to save the launch.ica file. If the user saves the file and double‐clicks it, Citrix opens but then displays an error:
The Citrix SSL server is not accepting connections.
Try clearing the browser’s temporary internet files. If this doesn’t resolve the issue, follow the instructions for adding the site to IE’s Trusted Sites, above. ﴾Strangely, the resolution in a few tickets is to reboot the router.﴿
Client installation
The user is able to authenticate at the Citrix login page. After clicking on an application, the user receives the error:
Connecting through Citrix secured gateway. Error reading from proxy server.
Uninstall and reinstall the Citrix client. Only the web plugin component should be installed
Session re-connection:
The user is able to authenticate at the Citrix login page. After clicking on an application, the user receives the error:
There are no existing applications available for re-connection.
This is simply an informational message stating there are no pre‐existing apps to reconnect to. It can be ignored if the user is not having an issue launching applications.
MSLicensing registry key
The user is able to authenticate at the Citrix login page. After clicking on an application, the user receives one of the following errors:
There is no route to the specified subnet address.
or
The Citrix MetaFrame server is not available. Please try again later.
To resolve, delete the MSLicensing registry key.
Click on the Start button, select Run and type in “regedit”.
Click OK.
The registry editor window will open.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing.
Click once on MSLicensing so it is highlighted and then hit the Delete key.
Close the registry editor and attempt to login to Citrix.
Connecting to the wrong application
The user receives the following error message in Citrix after entering a username and password at the Client window:
The system could not log you into the network.
Make sure your name and connection information are correct, then type your password again.
The user is likely trying to connect to the wrong application. For example, a Chicago user may have clicked on the DC Desktop application.
Issues after successfully authenticating at the Client window
Reconnecting to a session
The user receives the following error message in Citrix after successfully authenticating at the Novell Client window:
Connection error: You have not been granted access to this published application
This issue can be resolved by a Citrix administrator. It may be due to an issue with a prior ‘disconnected’ session not connecting correctly. The administrator can reset the session.
Printer unavailable issues
The user cannot find the local printer in the list of available printers.
Disconnect from Citrix, set the local printer to be the default printer, confirm that the Native Client is the selected Citrix client under Advance Options, and reconnect to Citrix. If the printer is still missing, uninstall and reinstall the Citrix client.
Printer offline issues
While connected to Citrix, the user receives periodic messages having to do with ‘a network printer is offline’.Check the physical printer. It is likely jammed or out of paper. It may also be that the printer is set to accept only certain paper types or sizes.
Confirm that the printer driver in Citrix is correct for that model printer.
Print jobs are not processed
In Citrix, a single print spooler is shared by all connections. A large print job can delay all other jobs, or a stuck job may prevent any other jobs from being processed. After ruling out other causes, contact the Citrix administrator to resolve.
MacPac
The user receives various errors when using MacPac.
If the user’s H: drive user folder is missing a \MacPac\Personal\ folder, copy yours to the user’s folder.
Lag :
Latency is the primary cause of poor performance in Citrix. Latency can be roughly measured by pinging the URL of the login server. Latency greater than 100ms will result in lag and other problems. An example of lag is when the user types in a Word document but the text doesn’t appear on the screen for a few moments, then catches up all at once.
Citrix window not responding
Shortly ﴾and sometimes immediately﴿ after authenticating at the Novell Client window, the Citrix window will stop responding.
The fix is to give the user full rights to the MSLicensing key.
Open Regedit and navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing
Right‐click on the MSLicensing key and select Permissions.
Under the Security tab, click on Users to highlight it.
Check the box in the Allow column next to Full Control.
Click OK and close Regedit.
Accessing the local machine’s hard drive:
Once in Citrix, right‐click on the Start button in the Citrix environment and select Explore.
Browse the list of drives in the left‐hand pane and locate “C$ on ‘Client’ ﴾C:﴿“. This is the local workstation’s C: drive.Click on the drive to open it.
How to allow Citrix access to the local machine’s hard drive and USB devices (including printers)
The first time you connect to Citrix, you’ll be shown a ICA Client File Security setting window where you can choose what access to your local machine you wish to grant to Citrix. You are also able to choose to “Never ask me again”.If you need to later change these settings, follow the appropriate steps below ﴾try the ‘newer clients’ step first﴿.
Newer clients:
While connected to Citrix, double‐click on the Citrix Connection Center icon in the system tray of the local machine. Click on the Security icon to configure the Session Security options for Files, Microphones/Webcams, PDA Devices, and USB/Other Devices.
Older clients:
Disconnect from Citrix. On the local machine, delete the webica.ini file under C:\Documents and Settings\[username]\Application Data\ICAClient. When you next reconnect to Citrix, you’ll be shown the ICA Client File Security setting window again.
Citrix Program Neighborhood
How to minimize the Citrix window to view the local machine’s desktop.
Shift+F2
SSL Errors:
SSL error 61 (the server certificate received is not trusted)
Run Windows Updates and update the root certificates.
SSL error 68 (the SSL certificate is not yet valid)
Set the local system clock to the current date and time.
SSL error 70 (the SSL certificate is no longer valid)
Set the local system clock to the current date and time.
SSL/TLS error: The certificate validation failed.
Confirm that the Native client, not the Java client, is in use by clicking on the Advanced Options link on the login screen.
http://support.citrix.com/article/CTX125056
Difference between Citrix UPM and Appsense:
Much faster logon, profile rollback, per user per application, we can deliver efficient profile also if profile size is big upm is not supporting and chances of profile corrupt. Support point of view it’s not good.
UPM: User login>> credential>> connected to one server>> profile has been downloaded as a roaming profile>> once user has been log off profile uploaded to back to the file share.
Appsense: Terminal server> Mandatory profile and Temporary profile, nothing has been downloaded, in place of pulling down the roaming profile we actually become more application.
Word> HTTP/HTTPS--------------- DB
Support point of view rollback is the major thing here
AppSense Pros
• Profile Management
• Policy Management
• Application Performance Management
AppSense Cons
Image Management
AppSense Pros
• Application Manager - automatic elevation of certain software to run with admin rights, transparent to users IF you set it all up properly in advance. Once you have this configured, it can be very beneficial.
• Environment Manager - custom actions based on detected conditions. For example, mapping one set of network drives once a user connects to a certain network, and a different set of network drives when they connect to a different network. And automatically remove the network drives when the user disconnects from the network. Do X, Y, and Z if a certain process starts or stops. If process A starts, automatically start process B.
AppSense Cons
• It's buggy in general. I have seen a lot of weird problems caused by AppSense. Corrupt user profiles, random crashes, etc.
• If/Else/ElseIf statements can be confusing to build, especially when nesting several due to the way they are displayed.
• Support is not great.
Citrix UPM Pros
• UPM does extend the features of Microsoft roaming profiles. It gives you the ability to load ADM files and create group policies to set settings.
• With UPM you are able to include or exclude files and folders in a user's profile.
• There are some tie ins between UPM and Citrix Director to give administrators the ability to quickly see the size of the user's profile.
Citrix UPM Cons
• Since UPM manages Microsoft roaming profiles you still face profile size challenges. You can use the exclude feature but it can be a bit limiting.
• Because of size concerns this may not be the best choice for international deployments if you intend to roam settings across multiple environments.
• Troubleshooting UPM can be a bit difficult at times. There are some built in logging features but those are best reviewed by Citrix.
UPM: User login>> credential>> connected to one server>> profile has been downloaded as a roaming profile>> once user has been log off profile uploaded to back to the file share.
Appsense: Terminal server> Mandatory profile and Temporary profile, nothing has been downloaded, in place of pulling down the roaming profile we actually become more application.
Word> HTTP/HTTPS--------------- DB
Support point of view rollback is the major thing here
AppSense Pros
• Profile Management
• Policy Management
• Application Performance Management
AppSense Cons
Image Management
AppSense Pros
• Application Manager - automatic elevation of certain software to run with admin rights, transparent to users IF you set it all up properly in advance. Once you have this configured, it can be very beneficial.
• Environment Manager - custom actions based on detected conditions. For example, mapping one set of network drives once a user connects to a certain network, and a different set of network drives when they connect to a different network. And automatically remove the network drives when the user disconnects from the network. Do X, Y, and Z if a certain process starts or stops. If process A starts, automatically start process B.
AppSense Cons
• It's buggy in general. I have seen a lot of weird problems caused by AppSense. Corrupt user profiles, random crashes, etc.
• If/Else/ElseIf statements can be confusing to build, especially when nesting several due to the way they are displayed.
• Support is not great.
Citrix UPM Pros
• UPM does extend the features of Microsoft roaming profiles. It gives you the ability to load ADM files and create group policies to set settings.
• With UPM you are able to include or exclude files and folders in a user's profile.
• There are some tie ins between UPM and Citrix Director to give administrators the ability to quickly see the size of the user's profile.
Citrix UPM Cons
• Since UPM manages Microsoft roaming profiles you still face profile size challenges. You can use the exclude feature but it can be a bit limiting.
• Because of size concerns this may not be the best choice for international deployments if you intend to roam settings across multiple environments.
• Troubleshooting UPM can be a bit difficult at times. There are some built in logging features but those are best reviewed by Citrix.
Technical Interview Questions for Citrix Engineer
Q1 - You have been asked
to reduce the time on Citrix support calls, by making sure your Citrix XenApp
6.5 farm is “Citrix Support Ready” and already has the proper tools installed
before contacting Citrix, what is the main tool you would install?
Citrix Scout
Q2- You will be migrating
from XenApp 6.5 to XenApp 7.6, what are two differences between IMA and FMA?
Some answers include: FMA uses Sites and no longer utilizes Zones or Zone Data Collectors, FMA uses Virtual Desktop Agents (VDA’s), FMA leverages MCS for Servers and Desktops, IMA uses Local Host Cache (LHC), IMA uses IMA Service.
Q3 - You have been tasked
to come up with an Active/Active GSLB scenario for your Citrix XenDesktop
environment. What are some underlying factors you should consider during your
research and planning phase?
You want to make sure you have a working way for data replication, including profile replication between the two sites. Microsoft does not support two way replication for their profiles. You will also need to make sure you have a way to disconnect sessions from each site. It is best to use Active/Passive with manual failover in this scenario.
Q4- You are creating a
XenApp/XenDesktop environment and your manager asked you to optimize your
profiles without using a third party solution. How would you accomplish this?
Citrix has User Profile Manager, which will allow you to streamline your profiles and leverage Microsoft folder redirection.
Q5 - You are migrating
your Citrix environment from a 2003 OS to 2008R2 OS, and you want to make sure
your current applications will run correctly on the 2008R2 OS. What software or
utility does Citrix provider you help you make sure your applications will be
compatible on the 2008R2 OS before the migration?
Citrix AppDNA
Q6 - How does Citrix
Netscaler licensing differ from the other Citrix product licensing?
As an appliance or hardware, Netscaler is separate from most other Citrix products that use a license server. It is licensed independently.
Q7- Can you name two of
the services required to be running on the Provisioning Server for it to
function?
SOAP and STREAM services must be running on the PVS Servers
Q8 - What are the two most
common ports used on XenApp ICA sessions? What are each used for?
Ports 1494 (ICA/HDX) and 2598(Session Reliability)
Q9- What is the Role of
the XenDesktop Controller?
A controller is the server-side architectural component of XenDesktop that is responsible for distributing desktops, managing user access, and optimizing connections.
Q10- You manager has
requested you to come up with a way for your helpdesk to monitor and
troubleshoot your XenDesktop/XenApp 7.x environment, without adding on a third
party solution. What built in Citrix functionality would you use to do so?
Citrix Director Enables level-1 and level-2 IT Support staff to monitor a XenDesktop deployment and perform day-to-day maintenance tasks. You can also view and interact with a user's session, using Microsoft Remote Assistance, to troubleshoot problems
Q11.- You are architecting
a Citrix Provisioning Services (PVS) deployment which will be placed across
different datacenters via a WAN link. You only want the PVS disks to be
streamed in each local datacenter and not cross over the WAN. What feature in
PVS would you use to accomplish this?
Subnet Affinity
Q12- What is the major
financial bottleneck of any VDI deployment?
Storage. Traditionally, storage has been very costly in getting a comparable VDI end user experience as opposed to the local desktop experience. There are several vender solutions on the market now to address this. Hint: You may want to have them mention some of these solutions as well.
Q13) - You are preparing a
PVS master target device which is created on VMware vSphere virtual hardware
version 10 or higher. What must you do with the CD/DVD Rom setting for PVS to
work correctly?
You will need to change the CD/DVD Rom to IDE instead of SATA. SATA is not supported in PVS.
Q14) - Citrix StoreFront
displays applications differently than Web Interface. Instead of having all
accessible applications appear on the home screen, first time users are invited
to choose (subscribe) to the applications they want to regularly use after they
logon. What function in Storefront must you use to avoid users having a blank
screen and automatically subscribe users to a few core applications when they
first logon?
Keywords
Q15) - What free tool from
Citrix will allow you to analyze your log files, profile your Citrix
environment, scan for known issues and attach a log file to a Citrix support
ticket.
Citrix Insight Services or TaaS
Discussion Based Questions:
Q16- What is the newest
version of XenApp you have worked with and tell me a little about your work on
it?
Q17) - Explain a difficult challenge you had with XenApp and or XenDesktop and what you did to solve it?
It should be fairly simple for an experienced person to come up with something.
Q18) - What is the latest version of XenDesktop you have worked with and explain a little about your work on it?
Q19) - Explain what you do to keep up your professional development?
You are looking for blogs, training (if they are willing to get training on their own, without relying on an employer), video’s and a biggie is home lab. There is not a good excuse in today’s climate for an engineer or architect not to have either a home or cloud based lab if they take their career seriously.
Q20) - If you were tasked
to architect a Citrix XenDesktop 7.6 environment, what would be some of the
questions you would ask the business, so you can design a technical solution?
You want to see if they know how to start with a business outcome and work backwards into the technology. Good signs are, asking specific business related questions such as: How do you envision the end goal, what are you trying to accomplish?, What is the importance of this project to the business (If highly important, that leads into DR questioning about RTO and RPO and the such?
Citrix Interview Questions- 3
1. What is Citrix receiver? And which version are you using?
Citrix Receiver is an easy-to-install software client that lets you access your desktops, applications and data easily and securely from any device, including smartphones, tablets, PCs and Macs. Working with a Citrix-enabled IT infrastructure, Receiver gives you the mobility, convenience and freedom you need to get your work done.
2. What is IMA? And what is the importance of it?
IMA - Independent Management Architecture.
It is use full for communication between server to server and server to management console.
It provides centralized framework for server to server communication.
It runs on all XenApp servers by default.
It uses TCP Port 2512 for communication from server to server through messages.
3. How to find which is Data Collector?
By using “Qfarm/load” command , we can able to find which XenApp server is Data Collector.
For identifying the DC IP address of the XenApp server is Post fix with “D”
Ex: 192.168.1.4D
4. What are XenApp versions?
• Presentation Server 4.5
• XenApp5.0
• Xenapp6.0
• XenApp6.5
5. What is shadowing & how to use shadowing?
“Shadowing” is a powerful tool for you to assist and monitor users.
Shadowing is useful for view another user’s session on another device.
By using shadowing you can monitor the session activity as if you are watching the screen of the client device that initiated the session.
6. How to find a user connected to which Xenapp server?
open App Center -> Farm -> Applications -> users tab.
7. How to find which is Database server?
C:\Program Files(x86)\Citrix\Independent Management Artechitecture\mf20
8. Which is the Database server/edition using in your company?
SQL server 2008 R2.
9. How to migrate datastore database from SQL2000 to SQL2005 OR How to recover datastore database?
Restore the DB to new server
Change mf20.dsn on all servers starting with data collectors
Restart IMA service on all servers
10. How to find out the datastore database server name?
Examine the DSN file which contains the connection details to the database.
C:\Program Files\Citrix\Independent Management Architecture\MF20.dsn
The following is an example of an MF20.dsn file from a server connecting to a remote SQL
instance:
[ODBC]
DRIVER=SQL Server
UID=useraccount
Address=MySqlServer,1433
Network=DBMSSOCN
DATABASE=myfarmdb
WSID=MyMfServer
APP=Citrix IMA
SERVER=MySqlServer
11. How to verify Datastore DB connectivity?
To determine if a server is communicating regularly with the data store, check the following,
Registry Key:
HKEY_LOCAL_MACHINE\SOFTWARE\CITRIX\IMA\DataStoreFailureTime
If the value is all zeros, the MetaFrame server is communicating with the data store.
12. How often does the member servers check datastore database?
By default for every 30 minutes.
13. What are the basic components required for XenApp installation?
1. Windows server 2008 R2 (64-bit)
2. .Net Framework 3.5 SP1
3. Windows server Remote Desktop Services (RDS) role.
4. Windows application server role.
5. Microsoft visual C++ 2005 SP1
C++ 2008 SP1 (64-bit)
6. Install IIS Service.
7. SQL 2005/2008/2012
-Microsoft SQL server 2008 Express SP3
-Microsoft SQL server 2008 R2 Express
-Microsoft SQL server 2008 R2
-Microsoft SQL server 2008 SP2
-Microsoft SQL server 2008 SP4
-Oracle 11g R2 Enterprise Edition.
8. RDS (Remote Desktop Services)/Terminal Services.
9. Java JRE
10. Citrix Licenses and RDS Licenses.
11. Citrix App Center Console.
14. What is ITIL?
The Information Technology Infrastructure Library (ITIL) is a set of practices for IT service management (ITSM) that focuses on aligning IT services with the needs of business
TIL describes processes, procedures, tasks and checklists that are not organization-specific, used by an organization for establishing integration with the organization's strategy, delivering value and maintaining a minimum level of competency. It allows the organization to establish a baseline from which it can plan, implement, and measure. It is used to demonstrate compliance and to measure improvement.
ITIL 2007 has five volumes, published in May 2007, and updated in July 2011 as ITIL 2011 for consistency:
1. ITIL Service Strategy: understands organizational objectives and customer needs.[5]
2. ITIL Service Design: turns the service strategy into a plan for delivering the business objectives.[6]
3. ITIL Service Transition: develops and improves capabilities for introducing new services into supported environments.[7]
4. ITIL Service Operation: manages services in supported environments.[8]
5. ITIL Continual Service Improvement: achieves services incremental and large-scale improvements.[9]
15. What is Virtual IP in web interface?
A virtual IP address (VIP or VIPA) is an IP address assigned to multiple applications residing on a single server, multiple domain names, or multiple servers, rather than being assigned to a specific single server or network interface card (NIC). Incoming data packets are sent to the VIP address which are routed to actual network interface.
16. What is Hosted Share Desktop (HSD) and Hosted Virtual Desktop (HVD)? Explain differences between them ?
Hosted Shared Desktops: A published desktop on XenApp. Users get a desktop interface, which can look like Windows 7. However, that desktop is actually being shared by every user on the server. Although we can configure restrictions and redirections to allow users to have a smaller impact on each other, there is still a risk. Many users to one desktop.
Hosted Virtual Desktops: A Windows 7/XP desktop running as a virtual machine where a single user connects remotely. One user’s desktop is not impacted by another user’s desktop configurations. Think of this as one user to one desktop. There are many flavors for the hosted virtual desktop model (existing, installed, pooled, dedicated and streamed), but they are all located within the data center
17. What are the differences between Receiver and Web plug-in?
Citrix Receiver is an easy to install software client that lets you access your desktops, application and data easily and securely from any device.
Citrix web plug-in allows users of any operating system to connect to virtual desktop applications. For browser web plug-in are needed.
18. What roles available in XenApp?
Common Roles:
• License Server
• Web Interface
• Merchandising Server
Other Roles:
• Secure Gateway
• Power and Capacity Management Administration
• EdgeSight Server
Role Subcomponents:
Default Components:
XenApp Server
XenApp Management
Windows Desktop Experience Integration
Other Components:
XML Service IIS Integration
EdgeSight Agent
Single Sign-On Plug-in
Power and Capacity Management Agent
19. How to find which Xenapp server you are running?
XenApp 6.0 or later— Goto Citrix Delivery Services Console > Farm > Expand Services > Click on any server > In the left side click on information or also look at the attachment.
Presentation Server – Goto Citrix Access Management Console > Farm > Click on any server in the farm > then, there is dropdown arrow > It contain alerts, information > click on information > then you can find out details.
20. How do you configure XenApp to EdgeSight?
Install Edgesight server:
Before install Edgesight server install prerequestisites(.net frame work, IIS, asp.net, message queeing service, sql) > install Edgesight 5.4 > open browser give computer name\Edge Sight > we will get edgesight > give necessary information.
Install Edgesight Agent:
Install Edgesight Agent in XenApp server and give necessary things.
21. What is the use of Citrix profile manger?
Citrix Profile Manager ensures that the user’s personal settings are applied to the user’s virtual desktop and applications, regardless of the location and end point devices.
Profile management is enabled through profile optimization service that provides an easy, reliable way for managing these settings in windows environment to ensure a consistent experience by maintaining a single profile that follows the user.
22. Which type of hardware server you are using in your organization?
We are using M610 blade servers.
23. How will you remove Citrix server from the farm?
If the server is unresponsive, remove it by right click on server in the console.
For functional server, remove it from add/remove programs
use CHFARM command
24. How will you remove citrix server from the datastore DB?
When citrix is uninstalled from the server, it cleans the entry from data store database. Additionally you can run this command to remove the entry from Datastore DB.
DSCHECK /servername
25. How to clean up datastore database?
DSCHEK without parameters will check for consistency and clean up the database. /clean parameter can be used to clean up specific server/application from the datastore but use with caution.
26. How to recover Citrix License Server?
The Citrix servers can function without contacting the license server and it is 30-days fault tolerant, and in Enterprise version an alert can be set with Resource Manager to send an email in case of License Server Connection Failure. If the license server reconnects at any time in the thirty days the problem resolves itself. If the server is not going to come back up, then the license file, digitally signed with the case-sensitive hostname of the old license server, is the critical component. The license file, a *.lic file, can be backed up to a thumb drive separately, and restored to a new server with the same name of the old license server, and the Citrix License server software installed.
27. What is new in XenApp 6.5?
Session Lingering
Session Pre-Launch
App Center
Load Evaluators assigned to Worker Groups or OUs instead of individual servers
Datastore and Zone information configured via GPO
Sesssion Only and Controller roles
Desktop Director web console can manage XenApp sessions
MultiStream ICA – ica traffic can be split into four separate TCP streams if required
Log On control feauture to drain users.
28. What is Printer driver replication and mapping?
Printer driver replication means if you have a network printer and if you want to share it among other Citrix servers, then we can replicate that driver to be used by all the Citrix servers or for few selected Citrix servers, however that driver should be installed in the Citrix server from which we are replicating the driver.
Printer mapping relates to mapping the driver software for specific domain users only, these can be dont by right clicking on the driver or by the printer option on the left plane of Citrix presentation server console.
29. What is Client Lock Down?
Typically ‘client lockdown’ is the process of securing an endpoint so that the user can only access authorised features. An example of this would be turning the device into a ‘Thin Client’ by locking it down so that an end user can only connect to published apps or desktops and can not use other features.
30. How do you manage remote hardware through HP iLo, DRack, etc?
If remote server is down by using HP ILO, DELL DRACK, IBM RSN we can able to connect to that server.
If we need to reestablish the server Break/prohibit the problematic server and login into the server by using HP ILO, DELL DRACK, IBM RSN.
31. What are change / problem / RCA / SLA?
Root cause analysis (RCA) is a method of problem solving that tries to identify the root causes of faults or problems that cause operating events.
RCA practice tries to solve problems by attempting to identify and correct the root causes of events, as opposed to simply addressing their symptoms. By focusing correction on root causes, problem recurrence can be prevented. RCFA (Root Cause Failure Analysis) recognizes that complete prevention of recurrence by one corrective action is not always possible.
A service-level agreement (SLA) is a part of a service contract where a service is formally defined. In practice, the term SLA is sometimes used to refer to the contracted delivery time (of the service or performance)
Problem Management is the process responsible for managing the lifecycle of all problems. The primary objectives of Problem Management are to prevent problems and resulting incidents from happening, to eliminate recurring incidents, and to minimize the impact of incidents that cannot be prevented.
32. Explain some scripting languages you used?
VB Script
Java Script
33. If a user get an error invalid username & password even though if he has given correct information? What will you do as troubleshoot?
If user get an error invalid username & password even though he has given correct information may be there is a problem with XML Broker or Active Directory.
Troubleshoot:
1. If it is a problem with XML Broker verify XML Broker is listening or not properly by using following,
• If you do a “Netstat –a” command from the CLI, you may see that it’s not listening on the XML port.
• “CTXXMLSS /u” first to unregister the service
“CTXXMLSS /r80” command to re-register the service on port 80
2. If the problem with Active Directory troubleshoot domain controller.
3. Otherwise check Event Viewer you will get some information about the error.
34. When users attempt to log on or launch applications through Web Interface is a hung? How to troubleshoot?
Web Interface 5.1.1 contains a fix to address an issue where connections to unresponsive XML brokers were not timed out correctly. With Web Interface 5.1.1 and above the Web Interface server will failover to the next XML Broker in the list when the current XML Broker does not respond within the socket timeout.
Cause
A common cause of errors when users attempt to log on or launch applications through Web Interface is a hung or partially unresponsive XML broker.
Web Interface is typically configured with multiple XenApp servers as XML brokers in either failover or load balancing mode. Prior to version 5.1.1, when multiple XML brokers are configured, if any XML broker is able to respond over the network but unable to process requests from Web Interface, the Web Interface server simply waits for a response until it times out rather than failing over to the next XML broker configured on the site. The most common reason for the XML service to become unresponsive is because it is busy waiting for a response from the IMA service. Therefore if IMA on the XML broker is hung or unresponsive it impacts the XML service and so forth.
The end result is that new users logging on to Web Interface do not receive a list of applications for any farm. Web Interface times out (after approximately two minutes) with the error shown above. Additionally, end users who are already logged on are unable to launch applications.
Resolution
Upgrade to Web Interface 5.1.1 or later and configure the failed server bypass time and XML Service Communication settings for each farm.
A fix is included in Web Interface 5.1.1 that improves resiliency when XML brokers get into an unhealthy state. Web Interface now has the ability to not only detect when the IMA service is stopped or crashed but also when the IMA service is running but in a hung or unresponsive state.
Note: Although these settings are available in Web Interface version 5.0.1, that version does not provide for the scenario in which the IMA service is running but in a hung state.
1. Edit the farm configuration settings in the Web Interface console to bypass any failed (XML broker) server, allowing sufficient time for the unresponsive server to be detected and recovered or isolated.
Note: Be sure to leverage health monitoring tools such as (HMR) Health Monitoring and Recovery on the XML brokers.
2. In the Manage Server Farms window, highlight the farm and Select Advanced to configure socket pooling and XML Service communication for all farms.
3. Under XML Service Communication, configure a timeout value for the XML socket (the connection between Web Interface and the XML service). This setting determines the amount of time that Web Interface waits for a response from a request sent over XML.
4. Configure the number of attempts that Web Interface makes to the XML service.
Citrix Receiver is an easy-to-install software client that lets you access your desktops, applications and data easily and securely from any device, including smartphones, tablets, PCs and Macs. Working with a Citrix-enabled IT infrastructure, Receiver gives you the mobility, convenience and freedom you need to get your work done.
2. What is IMA? And what is the importance of it?
IMA - Independent Management Architecture.
It is use full for communication between server to server and server to management console.
It provides centralized framework for server to server communication.
It runs on all XenApp servers by default.
It uses TCP Port 2512 for communication from server to server through messages.
3. How to find which is Data Collector?
By using “Qfarm/load” command , we can able to find which XenApp server is Data Collector.
For identifying the DC IP address of the XenApp server is Post fix with “D”
Ex: 192.168.1.4D
4. What are XenApp versions?
• Presentation Server 4.5
• XenApp5.0
• Xenapp6.0
• XenApp6.5
5. What is shadowing & how to use shadowing?
“Shadowing” is a powerful tool for you to assist and monitor users.
Shadowing is useful for view another user’s session on another device.
By using shadowing you can monitor the session activity as if you are watching the screen of the client device that initiated the session.
6. How to find a user connected to which Xenapp server?
open App Center -> Farm -> Applications -> users tab.
7. How to find which is Database server?
C:\Program Files(x86)\Citrix\Independent Management Artechitecture\mf20
8. Which is the Database server/edition using in your company?
SQL server 2008 R2.
9. How to migrate datastore database from SQL2000 to SQL2005 OR How to recover datastore database?
Restore the DB to new server
Change mf20.dsn on all servers starting with data collectors
Restart IMA service on all servers
10. How to find out the datastore database server name?
Examine the DSN file which contains the connection details to the database.
C:\Program Files\Citrix\Independent Management Architecture\MF20.dsn
The following is an example of an MF20.dsn file from a server connecting to a remote SQL
instance:
[ODBC]
DRIVER=SQL Server
UID=useraccount
Address=MySqlServer,1433
Network=DBMSSOCN
DATABASE=myfarmdb
WSID=MyMfServer
APP=Citrix IMA
SERVER=MySqlServer
11. How to verify Datastore DB connectivity?
To determine if a server is communicating regularly with the data store, check the following,
Registry Key:
HKEY_LOCAL_MACHINE\SOFTWARE\CITRIX\IMA\DataStoreFailureTime
If the value is all zeros, the MetaFrame server is communicating with the data store.
12. How often does the member servers check datastore database?
By default for every 30 minutes.
13. What are the basic components required for XenApp installation?
1. Windows server 2008 R2 (64-bit)
2. .Net Framework 3.5 SP1
3. Windows server Remote Desktop Services (RDS) role.
4. Windows application server role.
5. Microsoft visual C++ 2005 SP1
C++ 2008 SP1 (64-bit)
6. Install IIS Service.
7. SQL 2005/2008/2012
-Microsoft SQL server 2008 Express SP3
-Microsoft SQL server 2008 R2 Express
-Microsoft SQL server 2008 R2
-Microsoft SQL server 2008 SP2
-Microsoft SQL server 2008 SP4
-Oracle 11g R2 Enterprise Edition.
8. RDS (Remote Desktop Services)/Terminal Services.
9. Java JRE
10. Citrix Licenses and RDS Licenses.
11. Citrix App Center Console.
14. What is ITIL?
The Information Technology Infrastructure Library (ITIL) is a set of practices for IT service management (ITSM) that focuses on aligning IT services with the needs of business
TIL describes processes, procedures, tasks and checklists that are not organization-specific, used by an organization for establishing integration with the organization's strategy, delivering value and maintaining a minimum level of competency. It allows the organization to establish a baseline from which it can plan, implement, and measure. It is used to demonstrate compliance and to measure improvement.
ITIL 2007 has five volumes, published in May 2007, and updated in July 2011 as ITIL 2011 for consistency:
1. ITIL Service Strategy: understands organizational objectives and customer needs.[5]
2. ITIL Service Design: turns the service strategy into a plan for delivering the business objectives.[6]
3. ITIL Service Transition: develops and improves capabilities for introducing new services into supported environments.[7]
4. ITIL Service Operation: manages services in supported environments.[8]
5. ITIL Continual Service Improvement: achieves services incremental and large-scale improvements.[9]
15. What is Virtual IP in web interface?
A virtual IP address (VIP or VIPA) is an IP address assigned to multiple applications residing on a single server, multiple domain names, or multiple servers, rather than being assigned to a specific single server or network interface card (NIC). Incoming data packets are sent to the VIP address which are routed to actual network interface.
16. What is Hosted Share Desktop (HSD) and Hosted Virtual Desktop (HVD)? Explain differences between them ?
Hosted Shared Desktops: A published desktop on XenApp. Users get a desktop interface, which can look like Windows 7. However, that desktop is actually being shared by every user on the server. Although we can configure restrictions and redirections to allow users to have a smaller impact on each other, there is still a risk. Many users to one desktop.
Hosted Virtual Desktops: A Windows 7/XP desktop running as a virtual machine where a single user connects remotely. One user’s desktop is not impacted by another user’s desktop configurations. Think of this as one user to one desktop. There are many flavors for the hosted virtual desktop model (existing, installed, pooled, dedicated and streamed), but they are all located within the data center
17. What are the differences between Receiver and Web plug-in?
Citrix Receiver is an easy to install software client that lets you access your desktops, application and data easily and securely from any device.
Citrix web plug-in allows users of any operating system to connect to virtual desktop applications. For browser web plug-in are needed.
18. What roles available in XenApp?
Common Roles:
• License Server
• Web Interface
• Merchandising Server
Other Roles:
• Secure Gateway
• Power and Capacity Management Administration
• EdgeSight Server
Role Subcomponents:
Default Components:
XenApp Server
XenApp Management
Windows Desktop Experience Integration
Other Components:
XML Service IIS Integration
EdgeSight Agent
Single Sign-On Plug-in
Power and Capacity Management Agent
19. How to find which Xenapp server you are running?
XenApp 6.0 or later— Goto Citrix Delivery Services Console > Farm > Expand Services > Click on any server > In the left side click on information or also look at the attachment.
Presentation Server – Goto Citrix Access Management Console > Farm > Click on any server in the farm > then, there is dropdown arrow > It contain alerts, information > click on information > then you can find out details.
20. How do you configure XenApp to EdgeSight?
Install Edgesight server:
Before install Edgesight server install prerequestisites(.net frame work, IIS, asp.net, message queeing service, sql) > install Edgesight 5.4 > open browser give computer name\Edge Sight > we will get edgesight > give necessary information.
Install Edgesight Agent:
Install Edgesight Agent in XenApp server and give necessary things.
21. What is the use of Citrix profile manger?
Citrix Profile Manager ensures that the user’s personal settings are applied to the user’s virtual desktop and applications, regardless of the location and end point devices.
Profile management is enabled through profile optimization service that provides an easy, reliable way for managing these settings in windows environment to ensure a consistent experience by maintaining a single profile that follows the user.
22. Which type of hardware server you are using in your organization?
We are using M610 blade servers.
23. How will you remove Citrix server from the farm?
If the server is unresponsive, remove it by right click on server in the console.
For functional server, remove it from add/remove programs
use CHFARM command
24. How will you remove citrix server from the datastore DB?
When citrix is uninstalled from the server, it cleans the entry from data store database. Additionally you can run this command to remove the entry from Datastore DB.
DSCHECK /servername
25. How to clean up datastore database?
DSCHEK without parameters will check for consistency and clean up the database. /clean parameter can be used to clean up specific server/application from the datastore but use with caution.
26. How to recover Citrix License Server?
The Citrix servers can function without contacting the license server and it is 30-days fault tolerant, and in Enterprise version an alert can be set with Resource Manager to send an email in case of License Server Connection Failure. If the license server reconnects at any time in the thirty days the problem resolves itself. If the server is not going to come back up, then the license file, digitally signed with the case-sensitive hostname of the old license server, is the critical component. The license file, a *.lic file, can be backed up to a thumb drive separately, and restored to a new server with the same name of the old license server, and the Citrix License server software installed.
27. What is new in XenApp 6.5?
Session Lingering
Session Pre-Launch
App Center
Load Evaluators assigned to Worker Groups or OUs instead of individual servers
Datastore and Zone information configured via GPO
Sesssion Only and Controller roles
Desktop Director web console can manage XenApp sessions
MultiStream ICA – ica traffic can be split into four separate TCP streams if required
Log On control feauture to drain users.
28. What is Printer driver replication and mapping?
Printer driver replication means if you have a network printer and if you want to share it among other Citrix servers, then we can replicate that driver to be used by all the Citrix servers or for few selected Citrix servers, however that driver should be installed in the Citrix server from which we are replicating the driver.
Printer mapping relates to mapping the driver software for specific domain users only, these can be dont by right clicking on the driver or by the printer option on the left plane of Citrix presentation server console.
29. What is Client Lock Down?
Typically ‘client lockdown’ is the process of securing an endpoint so that the user can only access authorised features. An example of this would be turning the device into a ‘Thin Client’ by locking it down so that an end user can only connect to published apps or desktops and can not use other features.
30. How do you manage remote hardware through HP iLo, DRack, etc?
If remote server is down by using HP ILO, DELL DRACK, IBM RSN we can able to connect to that server.
If we need to reestablish the server Break/prohibit the problematic server and login into the server by using HP ILO, DELL DRACK, IBM RSN.
31. What are change / problem / RCA / SLA?
Root cause analysis (RCA) is a method of problem solving that tries to identify the root causes of faults or problems that cause operating events.
RCA practice tries to solve problems by attempting to identify and correct the root causes of events, as opposed to simply addressing their symptoms. By focusing correction on root causes, problem recurrence can be prevented. RCFA (Root Cause Failure Analysis) recognizes that complete prevention of recurrence by one corrective action is not always possible.
A service-level agreement (SLA) is a part of a service contract where a service is formally defined. In practice, the term SLA is sometimes used to refer to the contracted delivery time (of the service or performance)
Problem Management is the process responsible for managing the lifecycle of all problems. The primary objectives of Problem Management are to prevent problems and resulting incidents from happening, to eliminate recurring incidents, and to minimize the impact of incidents that cannot be prevented.
32. Explain some scripting languages you used?
VB Script
Java Script
33. If a user get an error invalid username & password even though if he has given correct information? What will you do as troubleshoot?
If user get an error invalid username & password even though he has given correct information may be there is a problem with XML Broker or Active Directory.
Troubleshoot:
1. If it is a problem with XML Broker verify XML Broker is listening or not properly by using following,
• If you do a “Netstat –a” command from the CLI, you may see that it’s not listening on the XML port.
• “CTXXMLSS /u” first to unregister the service
“CTXXMLSS /r80” command to re-register the service on port 80
2. If the problem with Active Directory troubleshoot domain controller.
3. Otherwise check Event Viewer you will get some information about the error.
34. When users attempt to log on or launch applications through Web Interface is a hung? How to troubleshoot?
Web Interface 5.1.1 contains a fix to address an issue where connections to unresponsive XML brokers were not timed out correctly. With Web Interface 5.1.1 and above the Web Interface server will failover to the next XML Broker in the list when the current XML Broker does not respond within the socket timeout.
Cause
A common cause of errors when users attempt to log on or launch applications through Web Interface is a hung or partially unresponsive XML broker.
Web Interface is typically configured with multiple XenApp servers as XML brokers in either failover or load balancing mode. Prior to version 5.1.1, when multiple XML brokers are configured, if any XML broker is able to respond over the network but unable to process requests from Web Interface, the Web Interface server simply waits for a response until it times out rather than failing over to the next XML broker configured on the site. The most common reason for the XML service to become unresponsive is because it is busy waiting for a response from the IMA service. Therefore if IMA on the XML broker is hung or unresponsive it impacts the XML service and so forth.
The end result is that new users logging on to Web Interface do not receive a list of applications for any farm. Web Interface times out (after approximately two minutes) with the error shown above. Additionally, end users who are already logged on are unable to launch applications.
Resolution
Upgrade to Web Interface 5.1.1 or later and configure the failed server bypass time and XML Service Communication settings for each farm.
A fix is included in Web Interface 5.1.1 that improves resiliency when XML brokers get into an unhealthy state. Web Interface now has the ability to not only detect when the IMA service is stopped or crashed but also when the IMA service is running but in a hung or unresponsive state.
Note: Although these settings are available in Web Interface version 5.0.1, that version does not provide for the scenario in which the IMA service is running but in a hung state.
1. Edit the farm configuration settings in the Web Interface console to bypass any failed (XML broker) server, allowing sufficient time for the unresponsive server to be detected and recovered or isolated.
Note: Be sure to leverage health monitoring tools such as (HMR) Health Monitoring and Recovery on the XML brokers.
2. In the Manage Server Farms window, highlight the farm and Select Advanced to configure socket pooling and XML Service communication for all farms.
3. Under XML Service Communication, configure a timeout value for the XML socket (the connection between Web Interface and the XML service). This setting determines the amount of time that Web Interface waits for a response from a request sent over XML.
4. Configure the number of attempts that Web Interface makes to the XML service.
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