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After rebooting my Citrix XenApp server,  I was presented with an error in the application event log for the Citrix application stating the following: “A usable server cannot be found on which to launch the application. Check your worker group definitions and load balancing policies to verify appropriate servers are assigned”.

Event_10001

Details blanked out to protect the innocent

After doing a lot of Google searching, I came across a forum with someone with the same problem, to verify the issue I ran the following command:

qfarm /load

It gave me a result of “1000” which apparently isn’t right

So to resolve this issue you have to rebuild the perfmon counters, in my example I am using Microsoft Windows 2008

lodctr.exe /r

Citrix_XenApp_Qfarm_lodctr
If you need to rebuild the counters for Microsoft Windows Server 2003, see this article here

Additionally, you will find a summary of what the qfarm values are here:

0 to 9998 = This is a normal range for the load manager
99999  = No load evaluator is configured
10000 = load is at 100 percent (full)
10000! = Application disabled for this server
10001 = Out of licenses
10002 = No ICA connections are available for that server
20000 = Incorrect server edition or a license mismatch
99990 = No permission to run qfarm

It fixed the problem for me, hopefully for you too.

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