sqsh & MS SQL Server - authentication?

["Karsten M. Self" <kmself@ix.netcom.com>]

I've recently discovered sqsh, a SQL shell designed to access Sybase and
MS SQL Server.  It seems weakly supported and the docs are poor, but it
might be a good tool if it works....

I'm currently having problems simply authenticating to my server.

I've identified it by IP address using nmblookup:

    $ nmblookup my-sqlserver
    querying my-sqlserver on 192.168.1.255
    192.168.1.20 my-sqlserver<00>

    $ sqsh -S 192.168.1.20 -U MY_USER
    sqsh-2.1 Copyright (C) 1995-2001 Scott C. Gray
    This is free software with ABSOLUTELY NO WARRANTY
    For more information type '\warranty'
    Password: 
    Msg 18456, Level 14, State 1

    Login failed for user 'MY_USER


Access under same NT userid works from Win2K.

System logs on the MS SQL Server box don't appear to show any
access/authentication failures.  This leads me to suspect I don't have
the right box, or am not getting through to it.

I don't know or understand the authentication process particularly well,
could anyone provide suggestions on debugging or properly authenticating
to the database server?

Thanks.

-- 
Karsten M. Self <kmself@ix.netcom.com>        http://kmself.home.netcom.com/
 What Part of "Gestalt" don't you understand?
    "What are you supposed to do if you are a manically depressed
    robot? No, don't bother to answer that, I'm fifty thousand times
    more intelligent than you and even I don't know the answer. It
    gives me a headache just trying to think down to your level."
    -- HHGTG