With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoDlswTConnOperDiscReason
cisco Data Link Switching T Connection Operation Disconnect Reason
1.3.6.1.4.1.9.10.9.1.2.3.1.19
This object signifies the reason that either prevented the transport connection from entering the connected state, or caused the transport connection to enter the disconnected state.
Back to CISCO-DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoDlswTConnOperDiscReason on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.