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

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Article ID: 843559 - View products that this article applies to.
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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.

RESOLUTION

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 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 software update that contains this hotfix.

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

   Date         Time   Version             Size  File name
   ---------------------------------------------------------
   12-Jul-2004  20:14  5.1.2600.1575  1,009,664  Winhttp.dll

STATUS

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

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

Properties

Article ID: 843559 - Last Review: November 15, 2007 - Revision: 1.7
APPLIES TO
  • Microsoft Windows HTTP Services 5.1, when used with:
    • the operating system: Microsoft Windows XP Professional
    • the operating system: Microsoft Windows XP 64-Bit Edition
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug KB843559

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