Error displayed in Session history within the InTrust Manager:
Object Name: Task
Operation: Session is stopping
Description: One or more if the task jobs don't have an InTrust server specified
This can be caused by a recent removal of an InTrust server within the Organization, once removed the server can no longer be referenced within a site or a job.
The entry where the InTrust Server name would have been is replaced by a GUID value.
Replace the GUID values in all Sites and Jobs with a currently available InTrust server.