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When many SSL connections are established on a Windows Server 2008-based computer, the computer eventually stops responding because of a memory leak

This article has been archived. It is offered "as is" and will no longer be updated.
After many Secure Sockets Layer (SSL) connections are established on a Windows Server 2008-based computer, the computer stops responding.

If you debug this problem, the debug log indicates that the Cngb and SslC tags are using most of the available paged pool memory.
This problem occurs because the Ksecdd.sys driver does not release the old SSL user context when renegotiation occurs. Each SSL user context uses some paged pool memory. Therefore, the system stops responding after the available paged pool memory is exhausted.

Hotfix information

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: 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.


No prerequisites are required.

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 Server 2008, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Lsasrv.mofNot Applicable13,78018-Dec-200721:23Not Applicable
Windows Server 2008, Itanium-based versions
File nameFile versionFile sizeDateTimePlatform
Lsasrv.mofNot Applicable13,78018-Dec-200721:23Not Applicable
Lsasrv.mofNot Applicable13,78018-Dec-200721:23Not Applicable
Windows Server 2008, x64-based versions
File nameFile versionFile sizeDateTimePlatform
Lsasrv.mofNot Applicable13,78018-Dec-200721:23Not Applicable
Lsasrv.mofNot Applicable13,78018-Dec-200721:23Not Applicable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about software update terminology, 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
memory-leak leakage hang

Article ID: 953535 - Last Review: 01/16/2015 02:32:15 - Revision: 4.0

Windows Server 2008 Standard, Windows Server 2008 Enterprise, Windows Server 2008 Datacenter, Windows Server 2008 Datacenter without Hyper-V, Windows Server 2008 Enterprise without Hyper-V, Windows Server 2008 for Itanium-Based Systems, Windows Server 2008 Standard without Hyper-V, Windows Web Server 2008

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