SEP12 prevent closing Ica session

At the Start of the month, we were hit by a very huge augmentation of the number of opened sessions on our farms, and lots of this sessions were idling… In fact, SEP12 start a process ccsvchst.exe for each user, but this process is not cleaned when the user is leaving.

To force Citrix to clean this type of process, we need to append it to the registry value : HKLM\System\CurrentControlSet\Control\Citrix\wfshell\TWI\LogoffCheckSysModules (CTX891671),

Hzre an example of GPO setting this value :

LogoffCheckSysModules