DOCUMENT:Q186905  10-AUG-2001  [winnt]
TITLE   :Radius Client Uses 100 Percent CPU on Invalid Response
PRODUCT :Microsoft Windows NT
PROD/VER:WinNT:4.0
OPER/SYS:
KEYWORDS:kbWinNT400sp4fix

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The information in this article applies to:

 - Microsoft Windows NT Server version 4.0 SP3 
 - Microsoft Routing and Remote Access Service Update for Windows NT Server version 4.0 
 - Microsoft Windows NT Server version 4.0, Terminal Server Edition 
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SYMPTOMS
========

When you use the Routing and Remote Access Service (RRAS) update with Radius
authentication and accounting, the MPROUTER process consumes 100 percent
processor time.

CAUSE
=====

The Radius server returned an invalid length field in a response packet.


RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
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


Apply the Routing and Remote Access Hotfix Pack 3.0. For your convenience, the
English version of this post-SP3 hotfix has been posted to the following
Internet location. However, Microsoft recommends that you install Windows NT 4.0
Service Pack 4 to correct this problem.

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/rras30-fix/

For additional information about the Routing and Remote Access Hotfix Pack 3.0,
see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q189594
   TITLE : RRAS Upgrade for WinNT Server 4.0 Hotfix Pack 3.0 Release Notes

STATUS
======

Microsoft has confirmed this to be a problem in Routing and Remote Access Update
for Windows NT version 4.0. This problem was first corrected in Windows NT 4.0
Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack
4.


Additional query words: tight loop
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Keywords          : kbWinNT400sp4fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400sp3 kbWinNTS400search kbNTTermServ400 kbNTTermServSearch kbAudDeveloper kbRRASNTSearch kbRRASNT400
Version           : WinNT:4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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Copyright Microsoft Corporation 2001.