This event occurs when one or more users fail over to their nonprimary, redundant Session Manager and the Global failback policy is set to manual.
Manual failback policy means that without manual intervention, the failed over users stays on this nonprimary Session Manager forever. This event reflects a notification of a potential problem and not loss in service.
You can find the primary Session Manager defined on the User administration page in Communication Profile and Session Manager Profile section as the first drop-down menu.
The possible causes for this event are:
The primary Session Manager is not running.
The user lost connectivity with the primary Session Manager due to network issues or any other reason.
The primary Session Manager is currently in the Deny New Service state.
The primary Session Manager is currently overloaded.
The primary Session Manager is in an error state which is preventing the user from receiving service from it.