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When you are finishing performance monitoring operations on your Windows 2000 Server computer, you notice that the memory being used by Lsass.exe is consistently increasing, regardless of the load being placed on the server.
This problem occurs when a client's User Datagram Protocol (UDP) request to the Kerberos Key Distribution Center (KDC) fails because the request exceeds the maximum UDP datagram size. The client will then retry the request by using TCP. This process is known as UDP/TCP failover. When this failover occurs, the client does not release the UDP buffers that were used in the original client request, and this causes the Lsass.exe memory leak.
This problem is apparent when clients issue ticket requests for user accounts that belong to a large number of security groups. The Kerberos ticket includes the group membership information. If a user account belongs to a large number of groups, this can cause the ticket size to exceed the UDP limit. When the ticket size exceeds the UDP limit, UDP/TCP failover occurs, which causes the Lsass.exe memory leak.
This problem occurs during both the interactive and logon processes.
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:
260910 How to Obtain the Latest Windows 2000 Service Pack
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. 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.