Microsoft has released a cumulative patch for Internet Information Server (IIS) 4.0, Internet Information Services (IIS) 5.0, and IIS 5.1. This patch includes the functionality of all security patches that have been released for IIS 4.0 since Windows NT 4.0 Service Pack 6a (SP6a), all security patches that have been released for IIS 5.0 since Windows 2000 Service Pack 2 (SP2), and all security patches that have been released for IIS 5.1
Download: Windows NT 4.0 Security Patch: Internet Information Services 4.0 Security Fix
Download: Windows XP Security Patch: Internet Information Services 5.1 Security Fix
Download: Windows XP 64-Bit Edition Security Patch: Internet Information Services 5.1 Security Fix
View: Security Bulletin for This Download
NAT-T and Firewall Rulesets
Because the new NAT-T code is designed around the IETF RFC 3193 and draft-02 of the IETF NAT-T specification, for these services to run through a firewall, you must open the following ports in the firewall rules:
Note: This may affect server configurations for third-party gateways.

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