With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgkHistoryEventTime
Cisco Gatekeeper History Event Time
1.3.6.1.4.1.9.10.40.1.2.2.1.3
The value of sysUpTime when the running configuration when the event occurred.
Back to CISCO-GATEKEEPER-MIB MIB page.
IPHost Network monitor allows you to monitor cgkHistoryEventTime 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.