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App-V Error 04-0000040F


On a Citrix XenApp/Presentation Server, an application can only be launched once.

Error Message / Sympthoms:

"An unexpected error occurred. Please report the following error code to your System Administrator."

A running virtualized application can not be launched again(a second time within a certain timeframe (about 10 minutes).

Potential Causes:

Citrix XenApp/Presentation Server CPU Managagement may prevent an App-V core process to launch the applikcation a second time.

Potential Solutions:

  • Create an exception to exclude SFTLIST.EXE as described here http://support.citrix.com/article/ctx113486 (for another software)

  • Do not use Citrix CPU Management at all (not recommended).

  • Modify the account and or amount of throtteling: HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\CTXCPU. A Value of 20000 equals 20%


(German) Deutscher App-V Blog: http://blogs.msdn.com/b/sgern/archive/2009/04/17/fehler-04-0000040f-m-gliche-ursache.aspx