Microsoft KB Archive/935760

= A memory leak occurs when a computer uses WinHTTP to connect to a Web server by using an SSL connection in Windows XP with Service Pack 2 =

Article ID: 935760

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional

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SYMPTOMS
When a computer connects to a Web server by using a Secure Sockets Layer (SSL) connection, a memory leak occurs in a process that uses Windows HTTP Services (WinHTTP). After this process runs continuously for a long time, you may be unable to open any applications. Or, the system may stop responding. For example, the system may stop responding after the process runs for a week or more.

This problem occurs if the following conditions are true:
 * The computer is running Microsoft Windows XP with Service Pack 2 (SP2).
 * The connection to the Web server requires authentication that uses the Basic method or the Digest method.



CAUSE
This problem occurs because of an error in the WinHTTP.dll file.



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
To apply this hotfix, you must have Windows XP Service Pack 2 (SP2) installed.

Restart requirement
You must restart the computer after you apply this hotfix.

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.

Windows XP, 32-bit versions


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 about Windows HTTP Services, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa384273.aspx

For more information about authentication, visit the following Microsoft Web site:

http://www.microsoft.com/windows/windows2000/en/advanced/iis/htm/core/iiabasc.htm

For more information about a similar problem in Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

918689 A memory leak occurs when you use WinHTTP to access a Web server over an SSL connection

For more information about the terms that are used to describe software updates, 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

Keywords: kbexpertiseinter kbbug kbfix kbhotfixserver kbqfe KB935760

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