Recently we have noticed that on our XenApp Citrix 6.X server it sometimes fails to launch applications on the web interface. When I login to the server internally I can see that the users have been logging in, closing the session then attempting again.
I have monitored a user logging into the server and note they instantly go into a "Disconnected" status.It almost appears as though the server accepts the login, then instantly orphans the session into a disconnected state. Here was a live example of where it required 4 sessions to successfully launch a published application:
User 1 - Disconnected User 1 - Disconnected User 1 - Connected User 1 - Disconnected
Now I have tested this on multiple computers running different OS, different browsers, different users - all result in the same instant.
We find the general "fix" is to simply kick all sessions of the user on the local server and then everything behaves. Undoubtedly upgrading to a newer version of XenApp would assist; but this is costly and at present outweighs the benefits.
I have had a look on the logs of this Windows Server 2008R2 (from memory) and cannot see any warning for services or applications. I have not been able to find any articles that point the blame at Windows Updates etc. that could cause this.
Has anyone else had this issue, and how so was it fixed if so?