When you try to access a Web site that is published in Microsoft Internet Security and Acceleration (ISA) Server 2004, you receive the following error message:
HTTP error 500: network name no longer exists (64 - host not available)
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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.
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To resolve this problem, apply hotfix 940709.
For more information about hotfix 940709, click the following article number to view the article in the Microsoft Knowledge Base:
940709 (http://support.microsoft.com/kb/940709/)
Description of the ISA Server 2004 hotfix package: July 25, 2007
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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