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Q222060: Err Msg: "Error 5: Access denied" When Using PPTP with RAS

Article: Q222060
Product(s): Microsoft Windows NT
Version(s): winnt:4.0,4.0 SP3,4.0 SP4
Operating System(s): 
Keyword(s): kbnetwork kbWinNT400sp5fix
Last Modified: 16-MAY-2002

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The information in this article applies to:

- Microsoft Windows NT Server versions 4.0, 4.0 SP3, 4.0 SP4 
- Microsoft Windows NT Workstation versions 4.0, 4.0 SP3, 4.0 SP4 
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SYMPTOMS
========

When you attempt to make a PPTP connection from a Windows NT 4.0 Service Pack 4
(SP4) client to a Windows NT 4.0 SP4 PPTP server running RAS or Routing and
Remote Access Service (RRAS), the initial authentication attempt may not work
and display an "Error 5: Access Denied" error message. This problem can also
occur if your PPTP client and server are running the post-Service Pack 3
PPTP3-fix hotfix.

CAUSE
=====

This problem occurs because there is a timing mismatch during the authentication
process between the client and server using MSCHAPv2 authentication.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Microsoft Windows NT
4.0. 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. This problem was
first corrected in Windows NT 4.0 Service Pack 5.

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

The hotfix must be applied to the PPTP client computer, installing the hotfix or
Windows NT 4.0 Service Pack 5 (SP5) to the PPTP server will not fix this
problem. In the very rare case where the client is another RRAS server, there is
also a RRAS-specific fix available if you choose to not install SP5.

Additional query words: pptp authentication MSCHAP MSCHAPv2 RRAS RAS

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Keywords          : kbnetwork kbWinNT400sp5fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTW400sp4 kbWinNTW400sp3 kbWinNTSsearch kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400search kbWinNTS400
Version           : winnt:4.0,4.0 SP3,4.0 SP4
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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