ISA Server 2006 incorrectly returns an "HTTP 304 Not Modified" response to a proxy client

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Article ID: 950534 - View products that this article applies to.
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SYMPTOMS

Microsoft Internet Security and Acceleration (ISA) Server 2006 may incorrectly return an "HTTP 304 Not Modified" response to a proxy client. For example, ISA Server 2006 may return an "HTTP 304 Not Modified" response to a proxy client when the content is changed or is expired.

CAUSE

This problem can occur if the client browser sends a request that includes the "If-Modified-Since" header field.

RESOLUTION

To resolve this problem, obtain and install the hotfix that is described in the following article in the Microsoft Knowledge Base:
951510 Description of the ISA Server 2006 hotfix package: April 9, 2008

STATUS

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

Properties

Article ID: 950534 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • Microsoft Internet Security and Acceleration Server 2006 Standard Edition
  • Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition
Keywords: 
kbprb kbsurveynew kbqfe KB950534

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