With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cspPskcCertSerialNum
csp Pskc Cert Serial Num
1.3.6.1.4.1.9.9.370.1.4.1.1.10
The serial number of the certificate assigned to the proxy service. If there is no serial number on the certificate, this will be a NULL string.
Back to CISCO-SSL-PROXY-MIB MIB page.
IPHost Network monitor allows you to monitor cspPskcCertSerialNum on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.