Microsoft KB Archive/246347

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Windows NT 4.0 Unable to Negotiate 40-bit Encryption When Connecting to a Windows 2000-Based Computer

Article ID: 246347

Article Last Modified on 2/21/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition

This article was previously published under Q246347


When you try to use a Dial-Up Networking connection from a Windows NT 4.0-based client computer to a Windows 2000-based computer that requires encryption, it may not work, and you may receive the following error message:

Error 629 The data link was terminated by the remote machine.


This problem can occur because a Windows 2000 server that is configured to require encryption has both 56-bit and 40-bit encryption levels selected. The Windows 2000-based computer first tries to negotiating a connection with the client at the higher level of encryption. The Windows NT 4.0-based client is then unable to properly negotiate a common, supported encryption level. Note that this problem affects the U.S. and Canadian versions, including the Export version of Windows NT 4.0.


A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone 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 usual 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 should have the following file attributes or later:

   Date      Time      Size     File name     Platform
   3/13/00   11:01pm   11,536   Rasccp.dll    i386
   3/13/00   11:00pm   19,216   Rasccp.dll    alpha


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Additional query words: ras rras chap ms-chap authentication ppp

Keywords: kbhotfixserver kbqfe kbipsec kbnetwork kbprb KB246347