samba - Jun 2002 - Client W98 doesn't login into a SAMBA Domain

Hi,

I have a Samba domain with W2K/W98 clients. The W2k clients works fine.
But when I use the W98 clients, they doesn't authenticate into the
domain. I write any username and the machine starts normally. I see the
users list into the sharing box, but they don't have any function with
W98. What do I do ???

Thanks,

Soh