Microsoft KB Archive/930700

= ISA Server 2004 returns reverse-proxy custom error pages, even in forward-proxy situations =

Article ID: 930700

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition

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SYMPTOMS
Consider the following scenario. You have a computer that is running Microsoft Internet Security and Acceleration (ISA) Server 2004, Enterprise Edition. On this computer, you create different versions of custom error pages to be returned in forward-proxy situations and in reverse-proxy situations. However, only reverse-proxy error messages are returned to the clients, even in forward-proxy situations. This problem occurs only if the client computers are configured as SecureNAT clients.



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

891024 How to obtain the latest ISA Server 2004 service pack



WORKAROUND
To work around this problem, configure the client computers as Web-proxy clients instead of as SecureNAT clients.



MORE INFORMATION
When internal clients in forward-proxy scenarios receive reverse-proxy custom error pages, the error messages may be misleading. These error messages may not contain sufficient information for troubleshooting.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kbprb atdownload kbexpertiseadvanced KB930700

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