Error 5123: The Computer Name You Specified Is Already in Use

Last reviewed: May 11, 1995
Article ID: Q126963

The information in this article applies to:

Microsoft Windows for Workgroups version 3.11

SYMPTOMS

When you start Microsoft Windows for Workgroups, you receive the following error message:

   The following error occurred while loading protocol number 0

   Error 5123: The computer name you specified is already in use on
   the network. Choose the Network Icon in Control Panel to specify a
   different name. For more information choose the Help button.

CAUSE

This error can occur if you have multiple network cards in your computer running on a single network segment and you are using the NetBEUI network protocol. The NetBEUI protocol tries to register the same computer name on the network once for each network card in the computer. When NetBEUI tries to register the second card on the network with the same computer name as the first card, the error occurs.

RESOLUTION

Use Network Setup to remove the NetBEUI protocol from all but one of the network cards in your computer.

KBCategory: kbnetwork kberrmsg
KBSubcategory: wfw wfwg
Additional reference words: 3.11

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.

Last reviewed: May 11, 1995
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.