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  2. The Microsoft Firewall service stops unexpectedly if a Web filter is used on a computer that is running ISA Server 2006

The Microsoft Firewall service stops unexpectedly if a Web filter is used on a computer that is running ISA Server 2006

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Symptoms

On a computer that is running Microsoft Internet Security and Acceleration (ISA) Server 2006, the Microsoft Firewall service stops unexpectedly. This problem occurs if the following conditions are true:
  • The http compression filter is configured to use the following settings:
    • The Return Compressed Data option is set to All Networks.
    • The Content Types list includes the Images content type.
    • The Request Compressed Data option is set to All Networks.
  • ISA Server has a Web filter that uses the WriteClient function.
  • Some clients make requests to retrieve image-file content through ISA Server.

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Cause

This problem occurs because of an access violation in the W3filter.dll module.

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Workaround

To work around this problem, do not include Images in the Content Types list for compression.

Note Most of the Images content types already include a compression algorithm. Therefore, this workaround does not affect traffic bandwidth.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem is scheduled to be fixed in ISA Server 2006 Service Pack 1.

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Keywords: KB944699, kbprb, kbtshoot, kbexpertiseadvanced, kbarchive, kbnosurvey

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Article Info
Article ID : 944699
Revision : 2
Created on : 1/15/2015
Published on : 1/15/2015
Exists online : False
Views : 301