Error message in ISA Server 2004: "MMC encountered an error with the snap-in Microsoft ISA Server 2004"

You click a policy in the Firewall Policy pane in Microsoft Internet Security and Acceleration (ISA) Server 2004. Then, you click the Protocols tab. In this situation, you receive the following error message:When you click OK in response to this message, you receive the following error message:

This issue occurs after you upgrade the operating system of the ISA Server 2004 computer from Microsoft Windows Server 2003 to Windows Server 2003 R2.

To resolve this issue, install Service Pack 2 for ISA Server 2004. For more information about how to obtain and install the latest service pack for ISA Server 2004, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.