To change your password just run passwd, auth/changeuser is an adminstrative command to change somone elses password rather than your own. It is normally run from the auth server's console.
The error "cs: cannot translate service" is more telling, I think your
lib/ndb/local doesn't have enough info, to tell ndb/cs how to find your
auth server.
You can check by typing:
ndb/ipquery sys $sysname auth
If you run auth/debug you can check this and some other bits and pieces.
-Steve
