Microsoft KB Archive/925882

= Error message when you try to access a Web site that is published through ISA Server 2004 SP2: &quot;HTTP 400 - Bad Request&quot; or &quot;Error Code: 500 Internal Server Error&quot; =

Article ID: 925882

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server Enterprise Edition Service Pack 2, when used with:
 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition Service Pack 2, when used with:
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition

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SYMPTOMS
When you try to access a Web site that is published through Microsoft Internet Security and Acceleration (ISA) Server 2004 Service Pack 2 (SP2), you receive one of the following error messages:

HTTP 400 - Bad Request

Error Code: 500 Internal Server Error.

Note Sometimes you may not receive an error message. However, the Web site or the Web program that you access may still not work correctly.



CAUSE
This problem occurs because ISA Server 2004 SP2 adds an additional space between some headers and their values. For example, the following header information may be sent by an ISA Server 2004 SP2 computer to the Web server:



When this behavior occurs in the host header, some Web servers incorrectly interpret this as a cookie name that starts with a :space. This causes some Web servers that are published through ISA Server 2004 SP2 to work incorrectly.



RESOLUTION
To resolve this problem, obtain the Update Rollup for ISA Server 2004 SP2. For more information about the Update Rollup for ISA Server 2004 SP2, click the following article number to view the article in the Microsoft Knowledge Base:

916106 Update for HTTP issues in Internet Security and Acceleration Server 2004 Service Pack 2



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

Keywords: kberrmsg kbtshoot kbqfe kbprb KB925882

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