DOCUMENT:Q240870 08-MAY-2002 [winnt] TITLE :"Access Denied" When SP5 RRAS Client Access SP5 RRAS Server PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP4,4.0 SP5 OPER/SYS: KEYWORDS:kbWinNT400PreSP7Fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 4.0, 4.0 SP5 - Microsoft Windows NT Server, Enterprise Edition versions 4.0, 4.0 SP4, 4.0 SP5 ------------------------------------------------------------------------------- SYMPTOMS ======== When you attempt to make a Point-to-Point Tunneling Protocol (PPTP) connection from a Windows NT 4.0 Service Pack 5 (SP5) client to a Windows NT 4.0 SP5 PPTP server running Remote Access Services (RAS) or Routing and Remote Access Services (RRAS), the initial authentication attempt may not succeed and may display an "Error 5: Access Denied" error message. This problem can also occur if RRAS is configured to forward Microsoft Challenge-Handshake Authentication Protocol (MS-CHAP) version 2 authentication requests to a Remote Authentication Dial-In User Service (RADIUS) server. CAUSE ===== This behavior is caused by a problem in Rasrad.dll, in which the challenge from the RRAS server to the client is incorrectly formatted. This problem results in the client rejecting the challenge and disconnecting the session. 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 Version Size File name Platform ------------------------------------------------------------- 07/27/99 09:28a 41,744 Rasrad.dll x86 07/27/99 09:26a 68,368 Rasrad.dll Alpha STATUS ====== Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article. MORE INFORMATION ================ For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base: Q189594 RRAS Upgrade for WinNT Server 4.0 Hotfix Pack 3.0 Release Notes Q189595 Performance and Security Upgrade for WinNT 4.0 Release Notes Q222060 Err Msg: 'Error 5: Access Denied' When Using PPTP with RAS To enable MS-CHAP with RADIUS authentication, you must add the following registry value: Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\PPP\CHAP Value Name: OfferMSCHAP Type: DWORD Data Value: 0x00000001 - Once this is enabled, every incoming Point-to-Point Protocol (PPP) connection is offered MS-CHAP, and MS-CHAP is used to authenticate each PPP user against the RADIUS server that your RAS server is using. Additional query words: IAS mschap ====================================================================== Keywords : kbWinNT400PreSP7Fix Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp5 kbWinNTS400search kbWinNTS400 Version : :4.0,4.0 SP4,4.0 SP5 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= 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 2002.