samba - Sep 2005 - Only guest access allowed

Hi all,

I'm having some issues when configuring Samba under Debian. The  
installation seems to be correct but when I try to access from a  
Windows XP client it is forced to use "guest" user instead of users  
defined in smb.conf.

I also have added passwords to users with the command smbpasswd. When  
I'm on the Control Pannel I have to add users thru expert mode  
(manually) as them do not appear in the list.

Help appreciated.

Tedi Roca