Microsoft has wunderfull products, but half the world is still using Citrix Presentation Servers for their terminal servers. The latest version is no longer called Presenation Server but is called XenApp. After version number 4 they change not only the name, but a lot of functionality, engine's as well as looks en feels. Personally I think the XenApp 5 product is nothing more than a Presentation server 4 with different screens, but XenApp version 6 is growing out to be a very good product, which will be used a lot in the worldwide. But, as all products, I ran into a serious problem lately, regarding the shadowing of users. Sure, we all blame the user at first, but as it occurs more often,... there had to be something else. Finally found a register key somewhere on the Citrix forums, that solved this issue for me, and now, this key is a common thing to do. Until they patch it or bring or come up with a newer vesion.

Underneath is a register key, which you can copy/paste, name it as a .reg file and import in the register of a XenApp 6 server.
Please note that these issue only occur when XenApp 6 is running on a Windows 2008 R2 server.


Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\Install]
"Setting"=hex:4c,0d,3f,33


After importing this register key, please reboot the server, and start shadowing a user logged on to that particulair machine.
You will notice it works. Implement this key on your other XenApp farm servers, and start helping your users by shadowing them.


Tip: Do not forget to put this registerkey in your standard VMware template, or your provisioning server!

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Ben OostdamBen Oostdam has been working with Windows systems since 1993. Worked for several companies as a system administrator, and is currently a Senior Support Engineer for Qurius Managed Services in the Netherlands specialized in System Center Solutions.

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