DOCUMENT:Q220954 10-AUG-2001 [winnt] TITLE :Event ID:20073 Attempting RADIUS Authentication on RRAS Server PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP4 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 SP4, used with: - Microsoft Routing and Remote Access Service Update for Windows NT Server version 4.0 ------------------------------------------------------------------------------- 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, perform one of the following: - 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: Q219283 How to enable MS-CHAP with Radius authentication STATUS ====== Microsoft has confirmed this to be a problem in Microsoft Windows NT Server version 4.0 with Routing and Remote Access Update. Additional query words: ====================================================================== Keywords : Technology : kbWinNTsearch kbWinNTSsearch Version : :4.0,4.0 SP4 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.