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.
This article has been archived. It is offered "as is" and will no longer be updated.
This article has been archived. It is offered "as is" and will no longer be updated.
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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: January 15, 2015 - Revision: 3.0
Applies to
  • Microsoft Internet Security and Acceleration Server 2006 Standard Edition
  • Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition
Keywords: 
kbnosurvey kbarchive kbprb kbsurveynew kbqfe KB950534

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