Article ID: 242349
Article Last Modified on 11/1/2006
APPLIES TO
- Microsoft Windows NT Server 4.0 Standard Edition
- Microsoft Windows NT 4.0 Service Pack 5
This article was previously published under Q242349
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:
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 that is described in this article. Apply it only to computers that are 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 about support costs, visit the following Microsoft Web site:
NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual 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 that this is 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:
240870 'Access Denied' When an SP5 RRAS Client Access an SP5 RRAS Server with OfferMSCHAP
Keywords: kbhotfixserver kbqfe kbbug kbfix KB242349
