Microsoft KB Archive/887720

= The front-end server may experience high CPU utilization when the front-end server parses an HTTP response from the back-end server =

Article ID: 887720

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
You are using a Microsoft Exchange Server 2003 configuration that has a front-end server and a back-end server. The front-end server may experience high CPU utilization when the front-end server parses an HTTP response from the back-end server.

Note To view the CPU utilization on the front-end server, click the Performance tab in Windows Task Manager.



CAUSE
This problem occurs if network issues cause the HTTP response to become corrupted. When the front-end server parses a corrupted HTTP response from the back-end server, the front-end server goes into an infinite loop.



Hotfix information
A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
Because of file dependencies, this software update requires Microsoft Exchange Server 2003 Service Pack 1 (SP1).

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

836993 How to obtain the latest service packs for Exchange Server 2003

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 tool in Control Panel.   Date         Time   Version            Size    File name --  30-Nov-2004  02:33  6.5.7232.56       412,160  Exprox.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, 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

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

817903 New naming schema for Exchange Server software update packages

Additional query words: XCCC

Keywords: kbqfe kbhotfixserver kbexchtransport kbfix kbbug kbpubtypekc KB887720

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