ping working, http not?!

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problem: ping to a host on the other side of a vpn works, http not.

environment:TMG on both sides, both have multiple external IPs and source side has them distributed over multiple network cards.

solution: Although I disabled web proxying and the network relation between the two vpn sites is routing, TMG still tries to access the target web server using one of it's external IPs. I tested pinging a host on the other side using various source IPs from the source TMG, I figured that only certain IPs work.
I finally configured all IPs onto one nic and it started to work.

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