We are having an issue with some Citrix/Terminal Server sessions that come in over the Citrix Web Interface. For some reason some of these sessions will not logoff after the 18 hour time limit and we also can't log them off through Terminal Services Manager or the Access Management Console. I also tried going into the task manager and manually killing the users processes but it won't kill the processes either. The only way to clear these "Ghost" sessions is to reboot the server. We are running Server 2008 x86 with XenApp5. The wierd thing is that issue is only happening to users who connect via the web interface. Does anyone have any idea of why this is happening or how to get these users logged off without rebooting?