[Samba] samba 3.0.4 : cannot join domain with w2k clients.

[HM]

Hello all.

I'm trying since a few jours to get my w2k clients join my domain, 
managed by my samba 3.0.4 PDC, without success. I can browse the server, 
share files with it with my station, but i can't join the domain. When i 
try to, i get the following message (sorry for the poor translation) :

    The following error occurred while trying to join domain 'SLS' :
    Failed to open a session : username unknown or invalid password.

I the logs, i get the following :

[2004/06/25 17:57:42, 0] lib/util_sock.c:get_peer_addr(978)
  getpeername failed. Error was Transport endpoint is not connected
[2004/06/25 17:57:42, 3] smbd/oplock.c:init_oplocks(1226)
  open_oplock_ipc: opening loopback UDP socket.
[2004/06/25 17:57:42, 3] smbd/oplock_linux.c:linux_init_kernel_oplocks(303)
  Linux kernel oplocks enabled
[2004/06/25 17:57:42, 3] smbd/oplock.c:init_oplocks(1257)
  open_oplock ipc: pid = 3791, global_oplock_port = 1065
[2004/06/25 17:57:42, 3] smbd/process.c:process_smb(890)
  Transaction 0 of length 72
[2004/06/25 17:57:42, 2] smbd/reply.c:reply_special(208)
  netbios connect: name1=SERVEUR         name2=SLS-PHY-14
[2004/06/25 17:57:42, 2] smbd/reply.c:reply_special(215)
  netbios connect: local=serveur remote=sls-phy-14, name type = 0
[2004/06/25 17:57:42, 0] lib/util_sock.c:get_peer_addr(978)
  getpeername failed. Error was Transport endpoint is not connected
[2004/06/25 17:57:42, 0] lib/util_sock.c:write_socket_data(413)
  write_socket_data: write failure. Error = Connection reset by peer
[2004/06/25 17:57:42, 0] lib/util_sock.c:write_socket(438)
  write_socket: Error writing 4 bytes to socket 5: ERRNO = Connection 
reset by peer
[2004/06/25 17:57:42, 0] lib/util_sock.c:send_smb(630)
  Error writing 4 bytes to client. -1. (Connection reset by peer)
[2004/06/25 17:57:42, 3] smbd/sec_ctx.c:set_sec_ctx(288)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2004/06/25 17:57:42, 2] smbd/server.c:exit_server(568)
  Closing connections
[2004/06/25 17:57:42, 3] smbd/connection.c:yield_connection(69)
  Yielding connection to
[2004/06/25 17:57:42, 3] smbd/server.c:exit_server(611)
  Server exit (process_smb: send_smb failed.)

Of course, the user root is correctly mapped in the username map, and 
the password is correctly set.

Any idea ?

Thanks !