A memory leak problem occurs when you run an application that uses the HttpSendRequest function of the WinHTTP API or of the WinINet API to send Secure Sockets Layer requests in Windows XP Service Pack 3
You have an application that uses the HttpSendRequest function of the WinHTTP API or of the Windows Internet (WinINet) API to send a Secure Sockets Layer (SSL) request. When you run this application in Windows XP Service Pack 3 (SP3) for some time, you may notice that the system performance decreases. This decrease occurs because of a memory leak in the application.
When the memory leak problem occurs, you may notice the following issues:
In the system Performance Monitor tool (Perfmon.exe), the memory usage for the process that uses the HttpSendRequest function increases linearly.
In Windows Task Manager, the memory usage increases.
This problem occurs because Windows XP SP3 introduces new code in the decoding function of the Crypt32.dll driver that is used by the WinINet API or by the WinHTTP API. This is an internal structure that is allocated to memory, but the allocation is never released. Therefore, 160 bytes of memory leak every time that an SSL request is made.
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.
To apply this hotfix, you must have Windows XP Service Pack 3 installed on the computer.For more 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
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
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 with Service Pack 3, x86-based versions
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the WinHTTP API, visit the following Web site: