Recommended Citrix and Microsoft Hotfixes for XenApp 6 and Windows Server 2008 R2

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Based on Citrix Technical Support experience and customer feedback, the following Citrix and Microsoft hotfixes have been found to resolve the most common issues with XenApp 6 and Windows Server 2008 R2. These hotfixes focus on basic functionality and stability. For a complete list of Citrix hotfixes for XenApp 6, please click here.




  • Installing hotfixes or performing a repair on the base product for Citrix XenApp 6 for Windows Server 2008 R2 can inadvertently remove the Citrix Licensing component, if present, from the system. This fix prevents the Citrix Licensing component from being removed when installing subsequent hotfixes.


  • Servers running XenApp 6 can become unresponsive while shutting down. The issue occurs when when the picadm.sys driver encounters certain error conditions that prevent it from shutting down gracefully


  • This enhancement is a part of the XenApp Printing Optimization Pack. The Printing Optimization Pack improves the user experience and printing speed by reducing the printer bandwidth required. For more information, including system requirements, required components, and known issues, see XenApp Printing Optimization Pack in eDocs, the Citrix Product Documentation Library.


  • This fix addresses session reliability issues that can occur when using multiple, disparate client devices to reconnect to the same session.


  • Certain applications fail to launch when Admin Approval Mode is enabled in User Account Control


  • This fix addresses a security vulnerability. For more information, see Knowledge Center article CTX128169


  • Attempts to log on to a XenApp 6 server using Version 7 or earlier of the clients can cause svchost.exe to exit unexpectedly. As a result, further connection attempts to the server fail until it is restarted.
  • The CPU consumption of the CitrixCseEngine.exe process can spike unexpectedly and cause logon delays.
  • Attempts to launch a published application that resides on a mapped network drive rather than on a XenApp server fail


  • Servers might experience a fatal exception, displaying a blue screen, with bugcheck code 0xf4 on IMAAdvanceSrv.exe.
  • Attempts to launch Windows Internet Explorer from an http, https, or mms hyperlink embedded in a streamed application fail. The issue occurs because XenApp 6 does not create the HKEY_CLASSES_ROOThtmlfileshellopennewcommand_backup registry key as part of server file type association


  • A Windows Server 2008 R2-based Remote Desktop server denies some connection requests randomly under heavy logon or logoff conditions


  • Delay when you shut down, restart, or log off on a Windows Server 2008 R2


  • Stop error in Windows 7 and in Windows Server 2008 R2 if a heavy load situation exists or if connectivity issues exist: “STOP: 0x000000B8”


  • A computer that is running Windows Server 2008 R2 stops responding randomly


  • An application or service that uses Winsock API or Winsock Kernel API may randomly stop responding in Windows Server 2008 R2


  • Installs 32-Bit help System 2008R2 may be required if hosting 32-bit applicaitons


  • Remote desktop sessions do not completely exit, and you cannot establish new remote desktop sessions to a computer that is running Windows Server 2008 R2


  • Startup takes a long time on a Windows 7 or Windows Server 2008 R2-based computer that has an Intel Nehalem-EX CPU installed


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