This OBJECT IDENTIFIER points to the specific counter object in the session error-statistics table that was incremented when the most recent session failure occurred, or the value {0.0} if the reason isn't tracked there. An admin follows this pointer to immediately identify the specific cause category of the last failure, such as a digest error or timeout, without having to check every error counter individually. For example, this OID pointing to the digest-errors counter tells the admin the last session failure was caused by a data or header checksum mismatch.