The number of sessions that have been closed due to unexpected error conditions or sessions that have reached the autodisconnect ...

The number of sessions that have been closed due to unexpected error conditions or sessions that have reached the autodisconnect timeout and have been disconnected normally. The autodisconnect timeout value represents the number of seconds that idle connections with no session attached to have before being disconnected automatically by a server. The default value is 30 seconds. This counter increments as a result of normal server operation, not as an indication of network problems or unexpected error condition.