With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cslbxStatsFailedConns
Cisco Server Load Balancing Stats Failed Conns
1.3.6.1.4.1.9.9.254.1.1.1.1.5
The number of connections that were load balanced to real servers that then failed to respond.
Back to CISCO-SLB-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cslbxStatsFailedConns 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.