Increased CPU usage and poor performance may occur when Outlook Web Access uses an SSL connection to a Exchange Server 2003 computer in a cluster that is running Windows Server 2003

When you configure Microsoft Outlook Web Access to use a Secure Sockets Layer (SSL) connection to a Microsoft Exchange Server 2003 computer that is running in a Microsoft Windows Server 2003 cluster, there may be a big increase in the usage of processor resources by the Lsass.exe process and by the Resrcmon.exe process. Additionally, the performance of the Exchange Server 2003 computer may be poor.

When you view the application log, you may see an event that is similar to the following:

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.

Prerequisites

This hotfix requires that you have installed Exchange Server 2003 Service Pack 1. For additional information about how to obtain the latest service pack, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You do not have to restart your computer after you apply this software update.

Hotfix replacement information

This hotfix replaces 843226.

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.

To work around this problem, disable the SSL connection, and then restart the server.

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

For additional information, click the following article number to view the article in the Microsoft Knowledge Base: For additional information, click the following article number to view the article in the Microsoft Knowledge Base: