A Memory Leak Occurs in Lsass.exe When You Use IMAP4 Over SSL on Exchange Server 5.5

Programs that use cryptographic functions that are provided by Schannel.dll may experience a memory leak. Programs that make many Secure Sockets Layer (SSL) connections rapidly may experience this leak. For example, Microsoft Exchange Server 5.5 Service Pack 4 (SP4) experiences this leak. The leak occurs in the Lsass.exe process when the Exchange Server computer is running on a Windows 2000 server.

This problem occurs when you access Exchange Server over Internet Message Access Protocol, Version 4rev1 (IMAP4) SSL port 993. If you use IMAP4 port 143 to access Exchange Server, this problem does not occur, because IMAP4 port 143 is not an SSL port.

Service Pack Information

To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix Information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix 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.



For additional information about this fix for Windows NT Server 4.0, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base: For additional information about how to install multiple hotfixes with only one restart, click the following article number to view the article in the Microsoft Knowledge Base: