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Windows Server 2003 Service Pack 1 Breaks RPC for ISA Server and How to Fix It (updated)

Windows Server 2003 Service Pack 1 breaks the ISA firewall's RPC filter. There are fixes available for both ISA Server 2000 and ISA Server 2004. Click the link for details.
Thomas Shinder photo

Windows Server 2003 Service Pack 1 Breaks RPC for ISA Server and How to Fix It (update)

Windows Server 2003 Service Pack 1 breaks the ISA firewall's RPC filter. This affects intradomain communications between the ISA firewall and the internal network, and the RPC filter''s control over secure Exchange RPC Publishing Rules.

Note:
Since the ISA firewall doesn't evaluate RPC inside SSL to SSL (or SSL to HTTP) bridged connections, this has no effect on Outlook 2003 RPC over HTTP communications.

Check out the fixes below:

ISA Server 2000:
http://www.microsoft.com/downloads/details.aspx?FamilyID=678cdcb6-6f05-45c0-acfa-d8e3774b8e9c


ISA Server 2004 Standard Ed.
http://www.microsoft.com/downloads/details.aspx?FamilyID=69c5d85c-5c80-473c-9cb4-60dda75d568d


ISA Server 2004 Enterprise Edition already includes the necessary update.

If you have already installed ISA Server 2004 Service Pack 1, you will not need to reapply it after installing Windows Server 2003 Service Pack 1.

Many thanks to Jim Harrison (www.isatools.org) for this update!

About Thomas Shinder

Thomas Shinder photo Dr. Thomas W. Shinder is an MCSE, MCP+I, and MCT. He has worked as a technology trainer and consultant in the Dallas-Ft. Worth metro area, assisting in development and implementation of IP-based communications strategies for major firms such as Xerox, Lucent and FINA.

Click here for Thomas Shinder's section.

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