Microsoft KB Archive/843559

= WinHTTP 5.1 may stop responding while serving a Web site on Windows XP Professional or Windows XP 64-bit Edition =

Article ID: 843559

Article Last Modified on 11/15/2007

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APPLIES TO

 Microsoft Windows HTTP Services 5.1, when used with:  Microsoft Windows XP Professional

 Microsoft Windows XP Professional for Itanium-based systems 

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SYMPTOMS
When you use Microsoft Windows HTTP Services (WinHTTP) 5.1 with Microsoft Internet Information Services (IIS) on a computer that is running Microsoft Windows XP Professional Service Pack 1 (SP1) or Microsoft Windows XP 64-Bit Edition, the IIS service may stop responding. When IIS stops responding, Windows HTTP Services also stops, and you cannot gain access to your Web site.



Hotfix Information
To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

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

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.

Windows XP Professional
  Date         Time   Version             Size  File name -  12-Jul-2004  19:11  5.1.2600.1575    331,776  Winhttp.dll

Windows XP 64-Bit Edition
<pre class="fixed_text">  Date         Time   Version             Size  File name -  12-Jul-2004  20:14  5.1.2600.1575  1,009,664  Winhttp.dll

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

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MORE INFORMATION
For additional 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

Additional query words: winhttp AV Access Violation critical section

Keywords: kbqfe kbhotfixserver kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug KB843559

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