Your workstation is passing it's authentication token to the server. Have you tried servername\login?

I use SQL Server authentication when not on a domain to get around these issues.

>Hi,
>
>I am stubbornly trying to connect my app from one computer to the SQL Server installed on another computer on my small LAN. With every step I think I am getting closer (just like to the horizon <g>).
>
>Anyway, in the last attempt I am getting a message "Login Failed for user 'ComputerName\Guest'" The "ComputerName is the computer where SQL Server 2008 resides. Since SQL Server is configured for Windows Authentication I am figuring (guessing) that SQL Server "sees" me as a "Guest" user. What do I need to change (in Windows Users or SQL Server) to make SQL Server 2008 allow the access?
>
>TIA.