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Q242349: ‘Error 5: Access Denied’ When Connecting Using PPTP

Article: Q242349
Product(s): Microsoft Windows NT
Version(s): 4.0,4.0 SP5
Operating System(s): 
Keyword(s): kbWinNT400PreSP7Fix
Last Modified: 11-JUN-2002

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The information in this article applies to:

- Microsoft Windows NT Server versions 4.0, 4.0 SP5 
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SYMPTOMS
========

When you attempt to make a PPTP connection from a client computer running
Windows NT 4.0 Service Pack 5 to a server running Windows NT 4.0 Service Pack 5
that is running Routing and Remote Access Service (RRAS), the initial
authentication attempt may not work and you may receive the following error
message:

  Error 5: Access Denied

This problem can also occur if (RRAS) is configured to forward MSCHAP v2
authentication requests to a Non-Microsoft Remote Authentication Dial-In User
Service (RADIUS) server.

CAUSE
=====

This problem occurs because there is a problem with negotiating MS Chap V2 with
NON Microsoft Radius servers. We have enabled a registry setting to negotiate MS
chap V1.

RESOLUTION
==========

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the
fix. 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

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The English-language version of this fix should have the following file
attributes or later:

  Date      Time                 Size    File name     Platform
  -------------------------------------------------------------
  09/22/99  03:02p               60,688  RASPPPEN.dll   (x86)
  09/22/99  03:01p               99,088  RASPPPEN.dll   (alpha)



WORKAROUND
==========

None

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT 4.0.

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

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.
To disable the forwarding of MS Chap V2 requests for RRAS Server, change the
following registry key to use the following value:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\rasman\ppp

Value Name: DisableMSChapV2
Data Type: REG_DWORD
Value: 0 or 1 where 1 disables the option.

For additional information, click the article number below to view the article in
the Microsoft Knowledge Base:

  Q240870 'Access Denied' When an SP5 RRAS Client Access an SP5 RRAS Server
  with OfferMSCHAP

Additional query words:

======================================================================
Keywords          : kbWinNT400PreSP7Fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400sp5 kbWinNTS400search kbWinNTS400
Version           : :4.0,4.0 SP5
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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