Each dormant TSO/E session has an idle application time, which is not adjustable, and a reconnect time (RECONTIME). The idle time cannot exceed 15 minutes. Otherwise, the CEA TSO/E address space manager will end the session regardless of reconnect time. To prevent your dormant sessions from ending because of idle time, issue a ping request at least once every 15 minutes, which informs CEA that all of the sessions for your application are still active. For more information, see CeaTsoPing - Sending a ping on behalf of an application.