Error message when you try to visit a Web site that is published in ISA Server 2004 or ISA Server 2006: "HTTP error 500: network name no longer exists"

When you try to access a Web site that is published in Microsoft Internet Security and Acceleration (ISA) Server 2004 or Microsoft Internet Security and Acceleration (ISA) Server 2006, you receive the following error message:

This problem occurs if the Web server sends a "100-Continue" response and then sends a "302-Moved" response that includes a "Connection:Close" header. In this situation, ISA Server incorrectly handles the connection header. ISA Server does not close the session to the Web server. Then, the client may reuse the session even though the Web server has already closed the session.

To resolve this problem for ISA Server 2004, apply hotfix 940709. For more information about hotfix 940709, click the following article number to view the article in the Microsoft Knowledge Base: To resolve this problem for ISA Server 2006, apply Service Pack 1. For more information about ISA Server 2006 Service Pack 1, 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.

For more information about how to install ISA Server hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base: