[Samba] Domain password server not available

[Theewara Vorakosit]

Dear All,
    I set up Windows 2000 domain controller. I run samba 2.2.7a-8.9.0 on 
Red Hat 9. I try to setup samba as a child of Windows 2000 domain. By 
smbpasswd -j ..... as mention in samba document. It display:

smbpasswd: Joined domain DOM.

But when I can not browse shared directory via Windows. Here is the log 
file.

[2003/04/21 17:35:06, 0] rpc_client/cli_netlogon.c:cli_net_req_chal(246)
  cli_net_req_chal: Error NT_STATUS_INVALID_COMPUTER_NAME
[2003/04/21 17:35:06, 0] rpc_client/cli_login.c:cli_nt_setup_creds(47)
  cli_nt_setup_creds: request challenge failed
[2003/04/21 17:35:06, 0] 
smbd/password.c:connect_to_domain_password_server(1367)
  connect_to_domain_password_server: unable to setup the PDC credentials 
to machine PRGSERVICE.CPE.KU.AC.TH. Error was : NT_STATUS_OK.
[2003/04/21 17:35:06, 0] smbd/password.c:domain_client_validate(1599)
  domain_client_validate: Domain password server not available.

Would you please tell me how to solve this problem?
Thanks,
Theewara