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Security Update, December 5, 2000

This update resolves the "Incomplete TCP/IP Packet" security vulnerability in Windows NT® 4.0. If a malicious user sends a large number of specifically malformed data packets to a Windows NT 4.0 computer on a network that uses the NetBIOS over TCP/IP (NBT) protocol, the affected computer temporarily stops responding to all network requests. This occurs because Windows NT 4.0 cannot process these data packets correctly using the NBT protocol. In rare cases, an attack can cause the affected computer to remain unresponsive until it is rebooted. Download now to ensure your Windows NT 4.0 computer is able to process invalid TCP/IP packets correctly.

For more information on this vulnerability, please read Microsoft Security Bulletin MS00-091. (This site is in English.)

System Requirements
This update applies to:

- Windows NT 4.0 Workstation
- Windows NT 4.0 Server

How to use
Restart your computer to complete the installation.

How to uninstall

1. Click Start, point to Settings, and then click Control Panel.
2. Double-click Add/Remove Programs.
3. Select Windows 4.0 Hotfix [See Q275567 for more information] and click Add/Remove to uninstall.

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