Error 64 — RPC/HTTP through the ISA Firewall – It’s not the Firewall’s fault – Case 669874521

An external user is unable to connect to the Exchange 2007 RPC/HTTP Web site. But internal users are able to. Clearly, the problem is with the ISA firewall, right? WRONG. Remember, in over 99% of cases when the ISA firewall is correctly configured, it’s not the firewall’s fault — it’s something else causing the problem.

Check out this article by Yuri Diogenes that explicates the problem with the Exchange CAS that caused a situation that made it look like an ISA firewall issue.



Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer

Prowess Consulting

PROWESS CONSULTING | Microsoft Forefront Security Specialist
Email: [email protected]
MVP — Forefront Edge Security (ISA/TMG/IAG)

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