The OrphanedSessionService removes orphaned session items from the ClickToConnect session repository. By default, the service is configured with the DCS.ClickToConnect module set to enabled=true and the Service.ClickToConnect configuration set to enabled=false. This service should be started on any instance where you have installed the DCS.ClickToConnect module and disabled on any instance configured with the Service.ClickToConnect module.

You can disable the service by setting the /atg/clicktoconnect/OrphanedSessionService.
properties file enabled property to false in your /localconfig directory.