Microsoft KB Archive/843196

= The performance of your computer may decrease significantly when you configure your Windows Server 2003-based computer to accept SSL connections =

Article ID: 843196

Article Last Modified on 7/24/2007

-

APPLIES TO


 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition

-



Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When you configure your Microsoft Windows Server 2003-based computer to accept incoming Secure Sockets Layer (SSL) connections, the performance of your computer may decrease significantly.



CAUSE
This issue occurs when the number of context handles that are stored in the hash table becomes very large.



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
No prerequisites are required.

Restart requirement
You must restart your 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) 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.

Microsoft Windows Server 2003, 32-bit editions
Date        Time   Version       Size     File name --- 09-Jun-2004 17:10  5.2.3790.183  153,600  Schannel.dll

Microsoft Windows Server 2003, 64-Bit Enterprise Edition
Date        Time   Version       Size     File name --- 09-Jun-2004 17:07  5.2.3790.183  481,280  Schannel.dll



MORE INFORMATION
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

The SSL context handle list is stored in a hash table as an array of linked lists. To speed up the performance of context lookups, this hotfix adds the UserContextListCount and UserContextLockCount entries to the registry in the following subkey:

You can modify the values of these registry entries to increase storage space in the hash table.

The default value of the UserContextListCount is 00000100. To increase performance, increase the value of this entry to 00000101 or more.

The default value of the UserContextLockCount entry is 00000008. To increase performance, increase the value of this entry.



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 additional information about the terminology that is used in this article, 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: kbqfe kbhotfixserver kbbug kbfix kbwinserv2003presp1fix KB843196

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.