DOCUMENT:Q214555  11-JUN-2002  [winnt]
TITLE   :RADIUS Server Fails to Authenticate Users in a Remote Domain
PRODUCT :Microsoft Windows NT
PROD/VER::4.0
OPER/SYS:
KEYWORDS:kbWinNT400sp5fix

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

 - Microsoft Windows NT Server version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

Microsoft Internet Authentication Server (RADIUS) can be used to authenticate
remote dial-in users from another domain if the Radius server's domain trusts
the user's domain.

To successfully authenticate users from a domain other than the RADIUS server's
domain, the user name supplied should be in the form of domain\user and the
Radius server's domain should trust the user's domain.

However, when you dial into a Routing and Remote Access server that is using a
Radius server for authentication, cross-domain authentication may fail even when
you specify the user name in the domain\user format.

RESOLUTION
==========

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


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Routing and Remote
Access Service Update for Windows NT Server 4.0. This problem was first
corrected in Windows NT version 4.0 Service Pack 5.


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

When installing the hotfix using Service Pack or hotfix.exe or hfx.exe the
following registry entries are added automatically. But, if applying the fix
manually then the following registry changes need to be done manually:

1. Start Registry Editor (Regedt32.exe).

WARNING: If you use Registry Editor incorrectly, you may cause serious problems
that may require you to reinstall your operating system. Microsoft cannot
guarantee that you can solve problems that result from using Registry Editor
incorrectly. Use Registry Editor at your own risk.

2. Locate the following key in the registry:

   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAS\Radius

3. On the Edit menu, click Add Value, and then add the following registry value:

   

   Value Name: DoNotStripDomainName      
   Data Type:  REG_DWORD
   Value:      1

4. Quit Registry Editor.

Additional query words: rras

======================================================================
Keywords          : kbWinNT400sp5fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : :4.0
Issue type        : kbbug
Solution Type     : kbfix

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

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.

Copyright Microsoft Corporation 2002.