[Samba] samba+winbind on nt Domain

[Marcos Aurélio]

hello,
I have installed in my machine with linux fedora Core 1 samba 3.XXX and when
I try to make the command
# net rpc join - S <my PDC> -U <Administrator>
it comes the following message:
[2004/06/29 11:13:17, 0] rpc_client/cli_netlogon.c:cli_nt_setup_creds(249)
  cli_nt_setup_creds: request challenge failed
Password:
[2004/06/29 11:14:08, 0] rpc_client/cli_netlogon.c:cli_nt_setup_creds(249)
  cli_nt_setup_creds: request challenge failed
[2004/06/29 11:14:08, 0] utils/net_rpc_join.c:net_rpc_join_newstyle(326)
  Error domain join verification: NT_STATUS_INVALID_COMPUTER_NAME


My PDC is NT 4.0, has configuration specifies for this?

Thanks,

Marcos