DOCUMENT:Q198585  10-AUG-2001  [winnt]
TITLE   :Windows 95 DUN Client Authentication Fails
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0
OPER/SYS:
KEYWORDS:kbnetwork

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

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

SYMPTOMS
========

When a Windows 95 client dials into a computer running Windows NT Server and is
authenticated using PPP, you may not be able to log on or access network
resources.

You may encounter some or all of the following error messages:

   No domain controller available to authenticate your password.

   Network path invalid

   System error 53 has occurred

   Request timed out

Windows 95 clients are the only clients that are affected by this problem.

CAUSE
=====

This situation is caused when the current service pack is not reapplied to the
server after RAS is added, removed, or reinstalled.

RESOLUTION
==========

Reapply the service pack to the RAS server.

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

Follow these guidelines to troubleshoot the issue:

Dial in with your Win95 client and attempt to PING the RAS server's IP address.
If no reply is received you may be experiencing this problem.

To ensure that only Windows 95 clients are affected, perform the same test with a
Windows NT DUN client.

A network trace with a packet capture tool, such as Network Monitor, should
reveal that the server is receiving packets from the Windows 95 client but is
not responding to them.

NOTE: There can be other causes for the above noted errors. For more information,
see the articles listed in the References section.

From the Service Pack 3 readme file:

   If you change or add new software or hardware components to your system after
   you have installed the Service Pack, you need to install the Service Pack
   again. This is because the files taken from the original Windows NT 4.0 disk
   set may not be the same as the files on the Service Pack disk set. You cannot
   install new components directly from the Service Pack media (such as a new
   keyboard or printer driver). You must install new components from the
   original product media and then reinstall the Service Pack.

   For example, if you install the SNMP service after installing Service Pack 3,
   you will need to reinstall the Service Pack. If you fail to do so, you will
   receive the error "Entrypoint SnmpSvcGetEnterpriseOID could not be located in
   snmpapi.dll." This is because some of the files in the SNMP service have been
   updated in the Service Pack and you have a version mismatch. Reinstalling the
   Service Pack fixes the problem by copying the newer versions of the files to
   your system.

REFERENCES
==========

For additional information, please see the following article(s) in the Microsoft
Knowledge Base:

   Q150053 Erratic Domain Logon from Windows 95 Dial-Up Networking

   Q178729 How To Configure Windows 95 to Dial into a RAS/RRAS Server

   Q154434 Err Msg: No Domain Server Was Available to Validate...

Additional query words: Win95 SP3 PPP

======================================================================
Keywords          : kbnetwork 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : winnt:4.0
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.

Copyright Microsoft Corporation 2001.