I have weird issue.
I have a Cisco ASA 5540 with 4 interfaces Outside,Inside, DMZ, TMG ( back to Back).
I have Microsoft TMG with 2 NICs. Internal Interface connected to Inside Switch and External directly connected to ASA TMG interface (Gi0/3).
I have default gateway on external interface pointing to ASA.
We are using TMG only as Web Proxy. Very often I start receiving call from user that cannot browse internet and they receive TMG error page.
When we move to TMG to diagnose the issue, we came to know that TMG cannot ping IP of ASA interface ( Gi0/3- Default of gateway TMG. In order to resolve this issue I have to reboot to the ASA.
Please can someone help to resolve this issue.