Microsoft KB Archive/248652

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Windows NT 4.0 Dial-Up Networking Clients Cannot Connect to 56-Bit Encryption Windows 2000 Servers

Article ID: 248652

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition

This article was previously published under Q248652


If you use Microsoft Internet Explorer or Windows NT 4.0, you may not be able to connect to a Server Gated Cryptography (SGC) Server for strong encryption using an IP Address or Alias.


You disable compression on your Windows NT 4.0-based computer, and then call to negotiate 40-bit encryption with a server running Microsoft Windows 2000 Server and accepts calls only with 40-bit and 56-bit encryption. After you dial the server, you are disconnected.


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone 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-language version of this fix should have the following file attributes or later:

   Date      Time                 Size    File name     Platform
   01/11/2000 5:35 PM            17.7K    RASCCP.dll     Alpha
   01/11/2000 5:29 PM            10.2K    RASCCP.dll     i386

To work around this issue, enable Windows NT 4.0 compression.


Microsoft has confirmed that this is a problem in Windows NT 4.0.


Cryptography defined:

The processes, art, and science of keeping messages and data secure. Cryptography is used to enable and ensure confidentiality, data integrity, authentication (entity and data origin), and nonrepudiation.

Server Gated Cryptography (SGC) technology, allows you to conduct 128-bit transactions with banks and financial institutions that support SGC.

This problem was originally found in servers with Routing and Remote Access Service (RRAS) Server and Virtual Private Network (VPN), but may exist on other computers, as well.

Additional query words: negotiating encryption , compression with 128 bit

Keywords: kbhotfixserver kbqfe kbbug kbfix kbnetwork KB248652