samba - Jan 2007 - problem establishing a trust to Win2003 and samba

Hello,

I have a problem establishing a trust to Win2003 (domaine testcoet) and samba
(domaine broceliande) where the Windows domain is  the trusted domain.
When I try to establish the trust from the samba side, I get the following 
error:

net rpc trustdom establish  testcoet

Could not connect to server W31INFO
[2005/06/22 11:41:35, 0, effective(0, 0), real(0, 0)] 
rpc_client/cli_pipe.c:cli_nt_session_open(1451)
  cli_nt_session_open: cli_nt_create failed on pipe \wkssvc to machine 
W31INFO.  Error was NT_STATUS_ACCESS_DENIED
[2005/06/22 11:41:35, 0, effective(0, 0), real(0, 0)] 
utils/net_rpc.c:rpc_trustdom_establish(4672)
  Couldn't not initialise wkssvc pipe

Dou you have find a solution ?