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  2. FIX: The ISA Server Firewall service crashes when a third-party Web filter calls the WriteClient function

FIX: The ISA Server Firewall service crashes when a third-party Web filter calls the WriteClient function

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Symptoms

Consider the following scenario:
  • In Microsoft Internet Security and Acceleration (ISA) Server 2006, you enable compression in the Web proxy.
  • You install a third-party Web filter that collects data and uses the WriteClient callback function to send the collected data.
In this scenario, the ISA Server Firewall service crashes when the third-party filter calls the WriteClient function.

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Cause

This problem occurs because of a race condition between the built-in compression filter and the third-party filter in which both filters collect data and then send that data to the client at the same time.

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Resolution

To resolve this problem, install the hotfix rollup package that is described in the following Microsoft Knowledge Base article:
970443 Description of the ISA Server 2006 hotfix package: April 21, 2009

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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.

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References

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

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Keywords: KB970440, kbqfe, kbsurveynew, kbfix, kbexpertiseinter, kbarchive, kbnosurvey

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Article Info
Article ID : 970440
Revision : 1
Created on : 1/16/2015
Published on : 1/16/2015
Exists online : False
Views : 420