This update resolves the "Malformed Domain Controller Service Request" security vulnerability in Windows 2000, and is discussed in Microsoft Security Bulletin MS01-011. Download now to prevent a malicious user from temporarily disrupting service on your domain controller.

A service that runs on Windows 2000 domain controllers incorrectly processes a certain type of invalid request. If a malicious user sends a continuous stream of specially malformed data packets to your domain controller, the data packets can consume your computer's resources and cause your domain controller to process service requests slowly or not at all. In some cases, this prevents the domain controller from authenticating users.

For more information about this vulnerability, read Microsoft Security Bulletin MS01-011. (This site is in English.)

• Windows 2000 Server
• Windows 2000 Advanced Server

1. Click Start, point to Settings, and then click Control Panel.
2. Double-click Add/Remove Programs.
3. Select Windows 2000 Hotfix (Pre-SP3) [See Q287397 for more information], and click Change/Remove to uninstall.