Samba Builtin_Administrators
This is taken from syslog :
Sep 24 21:29:15 localhost smbd[9789]: [2008/09/24 21:29:15, 0] auth/auth_util.c:create_builtin_administrators(785)
Sep 24 21:29:15 localhost smbd[9789]: create_builtin_administrators: Failed to create Administrators
Sep 24 21:29:15 localhost smbd[9789]: [2008/09/24 21:29:15, 0] auth/auth_util.c:create_builtin_users(751)
Sep 24 21:29:15 localhost smbd[9789]: create_builtin_users: Failed to create Users
Sep 24 21:29:15 localhost smbd[9791]: [2008/09/24 21:29:15, 0] auth/auth_util.c:create_builtin_administrators(785)
Sep 24 21:29:15 localhost smbd[9791]: create_builtin_administrators: Failed to create Administrators
Sep 24 21:29:15 localhost smbd[9791]: [2008/09/24 21:29:15, 0] auth/auth_util.c:create_builtin_users(751)
Sep 24 21:29:15 localhost smbd[9791]: create_builtin_users: Failed to create Users
It seems that you didnt add the idmap parameter. Try to edit /etc/samba/smb.conf , and take a look the idmap part of your smb.conf.
[global]
idmap uid = 15000-20000
idmap gid = 15000-20000
Then Restart samba & winbindd :
# service smb restart
# service winbindd restart