Scheduler doesn't notify about all errors occurred while maintaining session activity. For example, if session was not connected within first time as well as connection was dropped, scheduler will not fire error event immediately. Instead, it will perform reconnection attempts according to FIX Engine settings. Only if all attempts will fail, scheduler will fire error event.

Once scheduler notified about inability to connect certain session, it will not perform more attempts to bring session to connected state until next logon (activity) time.