Microsoft KB Archive/220954

= Event ID:20073 attempting RADIUS authentication on RRAS server =

Article ID: 220954

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT 4.0 Service Pack 4, when used with:
 * Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0

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This article was previously published under Q220954



SYMPTOMS
When you dial into a computer running Windows NT Server and Routing and Remote Access Service (RRAS), the following error message may be displayed on your RAS client computer:

Error 629: You have been disconnected from the computer you dialed.

Additionally, the following error is logged in the Event Viewer of the Windows NT 4.0 RRAS server (after every attempted incoming call):

Event ID: 20073

Source: Router

Type: Error

Description: The following error occurred in the Point to Point Protocol module on port %port%. There are no authentication protocols available for use.

Incoming calls to the Windows NT RRAS server are not able to connect.



CAUSE
This problem occurs because your Windows NT RRAS server's authentication and encryption settings are set to require Microsoft encrypted authentication and you are using Remote Authentication Dial-In User Service (RADIUS) as your authentication provider.



RESOLUTION
To resolve this problem, use one of the following methods:  Set Authentication and Encryption settings to Require encrypted authentication or Allow any authentication including clear text.

-or-

 Leave Authentication and Encryption settings set to Require Microsoft encrypted authentication and set OfferMSCHAP to 1 in the registry. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

219283 How to enable MS-CHAP with Radius authentication





STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.



MORE INFORMATION
Microsoft has released an improved version of MS-CHAP. For more information about MS-CHAP version 2, visit the following Microsoft Web site:

http://www.microsoft.com/technet/isa/2004/help/FW_MSChap.mspx?mfr=true

Keywords: kbprb KB220954

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