Microsoft KB Archive/126963

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

Article ID: 126963

Article Last Modified on 9/25/1999

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APPLIES TO


 * Microsoft Windows for Workgroups 3.11

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This article was previously published under Q126963



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.



MORE INFORMATION
Additional query words: 3.11

Keywords: KB126963

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