[Samba] browsing shares with ads

[Michael Dickens]

hi,
i have a vanilla redhat 3 i'm trying to integrate into an ads tree. i
think i'm pretty much there, but...
net ads join worked
net ads info works
wbinfo -u works
wbinfo -a user works
smbclient -L localhost -U domain\user doesn't (but smbclient -L
localhost does)

if i try to browse from xp i can use a local (redhat) user to browse,
but not the domain.

192.168.0.134.log gives:
[2005/07/26 14:28:00, 1] smbd/sesssetup.c:reply_spnego_kerberos(250)
  Username PORTFIELD\stevep is invalid on this system

wierdly enough i did have it working for a couple of minutes, but then i
did something...

i've tried the documentation and google, but have just got bogged down.
any pointers or suggestions would be gratefully received.

thanks,
mike.