samba - Aug 2003 - Samba as PDC in mixed XP/98 Client base

I?ve gotten a basic Samba 2.2.7a setup working as a PDC for Windows 98
without too much hassle (once I read the friendly manual it was easy!).
However, when I try to log onto the domain from XP Pro, the user
receives an ACCESS DENIED message. The docs and books I have don?t
mention XP at all so if anyone has any ideas on what?s going on (i.e.
they have fixed this issue) OR perhaps it?s some M$ have done to break
Samba?
?
I?m using Mandrake 9.1 and SWAT for configuration, primarily using the
wizard to get things rolling using Samba as the domain controller.
I love Samba and I?ve been using it off and on for years now but I?ve
never actually tried using it as a PDC (for ANY NT client) and this is
where I?ve come unstuck! Unfortunately I don?t have a Win2000 system to
check it out with.
Cheers for any help anyone can offer.
Marc

Thank you, to those who have answered this question! I am sure that's
solved the issue although I haven't implemented the fix yet. My incoming
mail has gone off due to server overload (happens all the time) so if I
haven't replied to everyone yet, be assured that I will when I get the
messages.

To those reading this... is there a comparison feature list between
Samba 2.x.x and Samba 3.0? I've read a little on the web and it's got me
drooling but I can't afford to jump in just until all (most) of the
buggies are out; I wish I had the same luxury with M$ software. This is
an application I want to work so I can prove to the doubters that Linux
really is better (not just cheaper) than Windows NT server.

Thanks again,

Marc