Microsoft KB Archive/132169

= Data Encryption Causes RAS NetBIOS Error 640 Error Message =

Article ID: 132169

Article Last Modified on 12/5/2003

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows for Workgroups 3.11

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This article was previously published under Q132169



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:

111094 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: KB132169

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