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I don't know if i am on the right forum for my question, apologies for the same.
In our corporate we are using TMG 2010 R2, our users are facing problem in connecting Cisco VPN which they use to connect to our client location, when the users initiate connection the logon prompt box for VPN credential appears, once the users put the credential they get a Error 427: Unknown Error occurred at Peer.Below attached is the error screenshot. we previously were using ISA 2006 it is woking perfectly fine and still working properly.
I have already added the UDP port 10000, 4500 and 500 onto the allow policy, i don't know if i am missing anything in TMG since its working perfectly in ISA. kindly help me on this since its taken a toll on me and i am not able to roll out ISA due to this problem.