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Q241400: IAS Hangs When Configured as RADIUS Client for Windows 2000

Article: Q241400
Product(s): Microsoft Windows NT
Version(s): 4.0,4.0 SP5
Operating System(s): 
Keyword(s): kbinterop kbWinNT4sp6fix
Last Modified: 16-MAY-2002

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0, Terminal Server Edition 
- Microsoft Windows NT Server version 4.0 SP5 
- Microsoft Windows NT Server, Enterprise Edition version 4.0 SP5 
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SYMPTOMS
========

After you configure your computer that runs Microsoft Internet Authentification
Service (IAS) 1.0 with the RADIUS/Proxy Server service as a client for a Windows
2000 based Remote Authentication Dial-In User Service (RADIUS) server,
authentication requests may be denied and the RADIUS/Proxy Server service on the
Windows NT 4.0 IAS server may stop responding (hang).

CAUSE
=====

This behavior occurs because the Proxy Server service is not decrypting and
encrypting MS-CHAP-MPPE keys correctly.

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

The user requesting authentication should be in the same domain as the Windows
2000 based RADIUS Server for the RADIUS/Proxy Server service to be configured
correctly.

IAS 1.0 is available either as part of the Microsoft Internet Connection Services
for RAS in the Microsoft Windows NT 4.0 Option Pack, or as part of the Microsoft
Commerical Internet System (MCIS) 2.0 in the Microsoft servers suites.

For additional information about Internet Authentification Service and Commerical
Internet System software, please visit the following Microsoft Web sites:

  http://www.microsoft.com/NTServer/commserv/deployment/moreinfo/ICS_FAQ.asp#4

  http://www.microsoft.com/mcis/default.asp

Additional query words:

======================================================================
Keywords          : kbinterop kbWinNT4sp6fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTS400sp5 kbWinNTS400search kbNTTermServ400 kbNTTermServSearch
Version           : :4.0,4.0 SP5
Issue type        : kbbug
Solution Type     : kbfix

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