Posted 04 March 2013 - 22:03
When you configure it in an environment without the TMG firewall, does it work? I've seen TMG cause issues like this before (numerous reasons) and logging everything based on IP address usually gives up the reasoning if it is TMG. If the rules are created in the firewall profile in use on each server, then it's usually not server-side.
I have seen Cisco network access protection on networks cause issues here too, but those showed up in the Cisco logs and were obvious.