With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
appnIsInCtrUpTime
appn Is In Control Up Time
1.3.6.1.2.1.34.4.1.6.2.1.11
Length of time the session counters have been active, measured in hundredths of a second.
Back to APPN-MIB MIB page.
IPHost Network monitor allows you to monitor appnIsInCtrUpTime 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.