Hi all,
I was hoping someone could clear up some confusion we have in relation to the failover mechanism employed by TMG 2010 (Standard Edition) in forwarding traffic to an upstream proxy server. Our TMG instance forwards traffic to a pair of Cisco IronPort Web Security Appliances (Primary & Secondary). We also have Connectivity Verifiers to these appliances to ensure they are still available.
My question is this. Do the Connectivity Verifiers influence the TMG mechanism that decides when to failover from the primary upstream proxy to the secondary? My reason for asking is that, recently we have observed TMG switching from primary to secondary for a short period of time (2-3 minutes) even when the primary upstream proxy is still available. If I increased the threshold in the Connectivity Verifier would this reduce the number of failovers?
Any assistance would be much appreciated.
John P