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Citrix XenApp 6.5 Prohibiting Logons

Matthew Evans

< 1 min read

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During a new installation of Citrix XenApp 6.5 I found that the logons to the server were being disabled automatically.  Even when manually enabled through the Citrix AppCenter, they would later show up as disabled again.  Running “QFARM /LOAD” showed the following:

QFARM /LOAD output

Eventually after stumbling on this Citrix Forum posting, it lead to the same solution.  When the XenApp 6.5 registry key is set to the following:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal Server]

Every time you run a GPUPDATE /FORCE the XenApp server will switch to ProhibitLogon and block new user logons.

The solution is to either manually set the key to the following either manually or through a Group Policy Preference:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal Server]

With the registry key configured in this manner, running GPUPDATE /FORCE no longer sets the server into ProhibitLogon Logon Mode.