DOCUMENT:Q132169 08-AUG-2001 [crossnet] TITLE :Data Encryption Causes RAS NetBIOS Error 640 Error Message PRODUCT :Windows for Workgroups and Windows NT Networking Issues PROD/VER:WINDOWS:3.11; winnt:3.5,3.51 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation versions 3.5, 3.51 - Microsoft Windows NT Server versions 3.5, 3.51 - Microsoft Windows for Workgroups version 3.11 ------------------------------------------------------------------------------- SYMPTOMS ======== If you attempt to connect to a Windows NT 3.5 or 3.51 RAS server with a Windows for Workgroups 3.11 RAS client, and you have selected Require Data Encryption, the following error appears: NETBIOS error 640: a netbios error has occurred (with failed code 0xa) CAUSE ===== Windows for Workgroups version 3.11 was released before the development of RAS data encryption in Windows NT version 3.5 and 3.51. Because Windows for Workgroups RAS cannot negotiate this encryption it displays the error. For information on other causes of Error 640, see the following article in the Microsoft Knowledge Base: Q111094 RAS ErrMsg: NETBIOS Error 640: A Netbios Error Has Occurred... WORKAROUND ========== Disable the "Require data encryption" option under the Encryption settings in the Network Configuration dialog of the Remote Access Setup window. Click Configure after you select Remote Access Service in Control Panel Network to view the Network Configuration dialog. Additional query words: prodnt 3.11 wfw wfwg access denied ====================================================================== Keywords : Technology : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search kbAudDeveloper kbWFWSearch kbWFW311 Version : WINDOWS:3.11; winnt:3.5,3.51 ============================================================================= 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.