samba - Mar 2001 - nt_status_invalid_workstation

Hi,
when i want to authenticate the passwords against a WinNT4
domaincontroller , i got the following error message:
[2001/03/06
18:35:36, 0] rpc_client/cli_netlogon.c:cli_net_sam_logon(391)  
cli_net_sam_logon: NT_STATUS_INVALID_WORKSTATION 

i joined the domain successfully with smbpasswd before.