The Microsoft Firewall service may crash when you use a custom Web filter in ISA Server 2004 to add headers to HTTP responses

When you use a custom Web filter in Microsoft Internet Security and Acceleration (ISA) Server 2004 to add headers to HTTP responses, the Microsoft Firewall service may crash. This problem typically occurs when the Web server first sends an HTTP "100-Continue" response before it sends the complete HTTP response.

When this problem occurs, the follow event is logged in the System log:

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7034
Date: Date
Time: Time
User: N/A
Computer: Computer
Description:
The Microsoft Firewall service terminated unexpectedly. It has done this 1 time(s).

Additionally, the following event is logged in the Application log:

Event Type: Error
Event Source: Microsoft Firewall
Event Category: None
Event ID: 14057
Date: Date
Time: Time
User: N/A
Computer: Computer
Description:
The Firewall service stopped because an application filter module c:\Program files\Microsoft ISA Server\w3filter.dll generated an exception code C0000005

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have ISA Server 2004 Service Pack 3 installed. To obtain the latest service pack for ISA Server 2004, visit the following Microsoft Web site:

Restart requirement

You do not have to restart the computer after you apply this hotfix. However, services that are related to ISA Server 2004 automatically restart during the hotfix installation process.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

ISA Server 2004 with Service Pack 3, Standard Edition

ISA Server 2004 with Service Pack 3, Enterprise Edition

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: