Data Encryption Causes RAS NetBIOS Error 640 Error Message

ID: Q132169

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 :
Version : WINDOWS:3.11; winnt:3.5,3.51
Platform : WINDOWS winnt
Issue type :