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Windows NT Server 4.0 | Downloads

Security Update, February 14, 2001

Select your language from the drop-down list below and click Next.


Read Me First

This update resolves the "Malformed PPTP Packet Stream" security vulnerability in Windows NT® 4.0, and is discussed in Microsoft Security Bulletin MS01-009. Download now to prevent a malicious user from causing your server to stop responding or fail.

The Point-to-Point Tunneling Protocol (PPTP) is a network service through which a local area network (LAN) connects to the Internet. The PPTP service in Windows NT 4.0 incorrectly processes a particular type of data packet. If a large number of specifically malformed data packets are sent to an affected server, it can exhaust the server's memory and cause the server to stop responding or fail. If this occurs, any PPTP sessions in progress are lost.

For more information about this issue, read Microsoft Security Bulletin MS01-009.

System Requirements

This update applies to Windows NT 4.0.

How to download and install

  1. Select your language from the drop-down list above.
  2. Click Next.
  3. On the following page, click Download Now.
  4. Do one of the following:
    • To start the installation immediately, select Run this Program from its Current Location.
    • To copy the download to your computer for installation at a later time, select Save this Program to Disk.
  5. Click OK.

How to use

Restart your computer to complete the installation.

How to uninstall

  1. Click Start, point to Settings and click Control Panel.
  2. Double-click Add/Remove Programs.
  3. Select Windows NT 4.0 Hotfix [See Q283001 for more information], and click Add/Remove to uninstall.

 Last Updated: Monday, May 21, 2001
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