[Samba] "You are not allowed to log in interactively"

[Hans Bergström]

"You are not allowed to log in interactively"
- or words to that effect. (It's in Swedih originally)
I have added a new user - useradd and smbpasswd -a
but he is not allowed to log on the domain from a W2k-server. Other users
can though. I have examined everything - i think - but apparently not what
causes this. Any ideas out there?
Thanks,
Hans