On Director Console version 7.15, when going to Filters>Sessions>All sessions and logging off user session for the second time, we get the error "Data source unresponsive or reported an error. View Director server event logs for further information."
The reported issue is reproducible with both Director versions 7.14.1 and 7.15 when pointing to the 7.15 Site.
Steps to reproduce the issue :
1. Launch Citrix Director and Go to Filters>Sessions>All sessions
2. Select Logoff for a session (Consider here that a user has multiple sessions listed in Director)
3. Session logs off.
4. Select another session for the same user and try to logoff. This time we will see the error "Data source unresponsive or reported an error. View Director server event logs for further information (Refer Citrix KB article CTX130320)"
5. Refresh Citrix Director and now you will be able to logoff the second session.