KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q174474: Installing RRAS Disables 128-bit RAS Encryption

Article: Q174474
Product(s): Windows for Workgroups and Windows NT Networking Issues
Version(s): 4.0,95
Operating System(s): 
Keyword(s): kberrmsg kbinterop kbnetwork win95
Last Modified: 09-AUG-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows NT Workstation version 4.0 
- Microsoft Windows NT Server version 4.0 
- Microsoft Windows 95 
- Microsoft Routing and Remote Access Service Update for Windows NT Server version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you dial into your Microsoft Windows NT Routing and Remote Access Service
(RRAS) Server, you may receive one of the following error messages depending on
the Remote Access Service (RAS) client that you are using:

Windows 95 using Dial-Up Networking 1.2
---------------------------------------

  Error 720: Dial-Up Networking could not negotiate a compatible set of network
  protocols you specified in the Server Type settings. Check your network
  configuration in the Control Panel then try the connection again.

Windows NT Server or Workstation (Service Pack 1 or 2, or no Service Pack)
--------------------------------------------------------------------------

If Require Data Encryption is Enabled:

  Error 742: The remote computer does not support the required encryption type.

If Any Other RAS Security Setting is Enabled:

  TCP/IP CP reported error 733: The PPP control protocol for this network
  protocol is not available on the server.

Windows NT Server or Workstation (Service Pack 3)
-------------------------------------------------

If Any RAS Security Setting is Enabled:

  TCP/IP CP reported error 733: The PPP control protocol for this network
  protocol is not available on the server.

Windows NT Server with RRAS Update
----------------------------------

If Require Strong Data Encryption is Enabled:

  Error 741: The local computer does not support the required encryption type.

If Any Other RAS Security Setting is Enabled:

  TCP/IP CP reported error 733: The PPP control protocol for this network
  protocol is not available on the server.

In addition to one of the above RAS client errors, your RRAS server will log the
following event log error in Event Viewer:

  Event ID : 20073
  Source : Router
  Description: The following error occurred in the %protocol_name% module on
  port %port_name%. The local computer does not support the required encryption
  type.

CAUSE
=====

Your RRAS server has been configured for 128-bit RAS Encryption, however
Ndiswan.sys has been replaced with the 40-bit version of the file.

RESOLUTION
==========

To resolve this issue, follow the steps in the following article in the
Microsoft Knowledge Base:

  Q169895 Enabling 128-bit Encryption for Routing and Remote Access

MORE INFORMATION
================

When you install Routing and Remote Access Service on top of Service Pack 3
(40-bit or 128-bit), it, by default, replaces Ndiswan.sys with a 40-bit
version.

If a RAS or PPTP connection is successful using 128-bit encryption, the following
event will be logged in Event Viewer on your RRAS Server:

  Event ID : 20142
  Source : Router
  Description: The user <username> has been connected and has been
  successfully authenticated on port <port_name>. Data sent and received
  over the link is strongly encrypted.

For additional information, please see the following articles in the Microsoft
Knowledge Base:

  Q104292 Identifying 128-bit Windows 95 DUN Client

Additional query words:

======================================================================
Keywords          : kberrmsg kbinterop kbnetwork win95 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbAudDeveloper kbWin95search kbZNotKeyword3 kbRRASNTSearch kbRRASNT400
Version           : :4.0,95
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.