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Q236584: 128-Bit RAS Client Is Authenticated but Cannot Use Resources

Article: Q236584
Product(s): Microsoft Windows NT
Version(s): winnt:4.0,4.0 SP5
Operating System(s): 
Keyword(s): kbWinNT4sp6fix
Last Modified: 20-MAY-2002

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0 SP5 
- Microsoft Windows NT Workstation version 4.0 SP5 
- Microsoft Routing and Remote Access Service Update for Windows NT Server version 4.0 
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SYMPTOMS
========

After you upgrade to Windows NT 4.0 Service Pack 5 (SP5), Windows NT 4.0-based
128-bit Remote Access Services (RAS) clients can successfully dial in to a RAS
server, but cannot access the server's network adapter or any other device on
the network. The issue occurs when you are using the Require Data Encryption
option with the Require Microsoft Encrypted Authentication setting. The client
is unable to ping any TCP/IP interface on the remote network, including the
Microsoft Virtual Private Networking Adapter (NDISWAN) IP address that the
server assigned to the client. This behavior does not occur with 40-bit RAS
clients or Microsoft Windows 95/Microsoft Windows 98 clients.

Routing and Remote Access Services (RRAS) Dial-on-Demand (DOD) connections that
use direct dial (Point-to-Point Protocol, or PPP), not Point-to-Point Tunneling
Protocol (PPTP), are also affected when you are using 128-bit updates with the
Require Data Encryption option with the Require Microsoft Encrypted
Authentication setting

RESOLUTION
==========

Windows NT Server or Workstation 4.0
------------------------------------

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the
individual software update. For information on obtaining the latest service
pack, please go to:

- http://www.microsoft.com/Windows/ServicePacks/

-or-

- Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft
Product Support Services. For a complete list of Microsoft Product Support
Services phone numbers and information on support costs, please go to the
following address on the World Wide Web:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS


Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------

To resolve this problem, obtain the latest service pack for Windows NT Server
4.0, Terminal Server Edition. For additional information, please see the
following article in the Microsoft Knowledge Base:

  Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


STATUS
======

Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT
Server 4.0, Terminal Server Edition.

This problem was first corrected in Windows NT Server 4.0 Service Pack 6 and
Windows NT Server 4.0, Terminal Server Edition Service Pack 6.

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

For additional information, click the article number below to view the article
in the Microsoft Knowledge Base:

  Q172215 How to Force 128-bit Data Encryption for RAS

Additional query words: encryption

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Keywords          : kbWinNT4sp6fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400search kbWinNT400search kbWinNTW400sp5 kbWinNTSsearch kbWinNTS400sp5 kbWinNTS400search kbAudDeveloper kbRRASNTSearch kbRRASNT400
Version           : winnt:4.0,4.0 SP5
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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