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XenApp 6.5 Unable to log in error "the task you are trying can’t be completed because Remote Desktop Services is currently busy"


We have recently deployed XenApp 6.5. We have a at least one user that when using the mobile app or on the desktop receive this error "the task you are trying can’t be completed because Remote Desktop Services is currently busy" This issue continued for some time before allowing the user access.

After looking into why this happened I have found no errors in logs or any where else. Test accounts seem to work fine connecting on both the mobile or pc.

We have applied the latest hotfix packs and as detailed Hotfix pack 2 had a fix for this issue.
We have also checked the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI  
to a longer time.

Any idea what would cause this and any solutions to this issue?

1 Solution
Ayman BakrSenior ConsultantCommented:
Did you install Windows 2008 R2 Service Pack 1? Please install it if not done.

In addition, ensure to install the following Microsoft post SP1 hotfixes:

Most likely, the issue can be fixed with the hotfixes Mutawati mentioned above.

If you only have the app(s) available from one server and the server was genuinely busy, this can occur.  Confirm that server-intensive processes, such as defrag, full anti-virus scan, etc., weren't running at that time.  Might there have been an issue with storage at that time?

If you have EdgeSight (it's a great tool for playing detective!!), you can correlate the exact time with everything that was occurring on the server at that time.  So, if this issue occurs again, think about installing EdgeSight and looking at the forensics.
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