Download Microsoft Internet Security and Acceleration (ISA) Server 2000 RPC Filter Update for Windows Server 2003 Service Pack 1 from Official Microsoft Download Center

Microsoft Internet Security and Acceleration (ISA) Server 2000 RPC Filter Update for Windows Server 2003 Service Pack 1

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Changes in RPC client/server behavior in Windows Server 2003 Service Pack 1 cause the ISA Server RPC filter to deny RPC access to computers running Windows Server 2003 with Service Pack 1. Install this update to fix this compatibility issue.