samba - Aug 2002 - (no subject)

I'm want use Samba on RH 7.2 as PDC.
My network it's a WinXP computers.

I'm add machine and users account in samba server but when i'm login
in domain from WinXP message "Access Denied" is recieved.

SAMBA log's

machine_name.log
[2002/08/23 13:15:59, 0] rpc_server/srv_samr.c:api_samr_set_userinfo(672)
  api_samr_set_userinfo: Unable to unmarshall SAMR_Q_SET_USERINFO.
[2002/08/23 13:15:59, 0] passdb/smbpass.c:startsmbfilepwent_internal(87)
  startsmbfilepwent_internal: unable to open file /etc/samba/smbpasswd. Error
was Permission denied
[2002/08/23 13:15:59, 0] passdb/smbpass.c:iterate_getsmbpwuid(1240)
  unable to open smb password database.