Hi,
According to the problem description, this issue is related to ISA Server. For ISA Server issue, the best resource is ISA Server forum.
Based on the current situation, you’d better submit a new question to ISA Server forum for further assistance. In this way, your issue can be resolved
effectively.
Forefront TMG and ISA Server
http://social.technet.microsoft.com/Forums/en-US/Forefrontedgegeneral/threads
Thanks for your understanding!
Regards,
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