samba - Mar 2006 - A question on Windows XP with Samba Linux ?

Hi

i have a small problems:

       I have a Linux Samba File server, on this, i have one directory 
where a
authentification are requested.

    That's work on all workstation, but only one can't connect.
   
I have only this into the log:

[2006/03/16 13:51:43, 3] smbd/sesssetup.c:reply_sesssetup_and_X_spnego(619)
  NativeOS=[Windows 2002 Service Pack 2 2600] NativeLanMan=[Windows 2002 
5.1] PrimaryDomain=[]
[2006/03/16 13:51:43, 3] libsmb/ntlmssp.c:ntlmssp_server_auth(606)
  Got user=[] domain=[] workstation=[ACERJLS] len1=1 len2=0
[2006/03/16 13:51:43, 3] auth/auth.c:check_ntlm_password(219)
  check_ntlm_password:  Checking password for unmapped user 
[]\[]@[ACERJLS] with the new password interface
[2006/03/16 13:51:43, 3] auth/auth.c:check_ntlm_password(222)
  check_ntlm_password:  mapped user is: [SERVEUR_IBM]\[]@[ACERJLS]
[2006/03/16 13:51:43, 3] auth/auth.c:check_ntlm_password(268)
  check_ntlm_password: guest authentication for user [] succeeded
[2006/03/16 13:51:43, 3] libsmb/ntlmssp_sign.c:ntlmssp_sign_init(319)
  NTLMSSP Sign/Seal - Initialising with flags:
[2006/03/16 13:51:43, 3] libsmb/ntlmssp.c:debug_ntlmssp_flags(62)
  Got NTLMSSP neg_flags=0x60088215
[2006/03/16 13:51:43, 3] smbd/password.c:register_vuid(257)
  User name: nobody     Real name: nobody
[2006/03/16 13:51:43, 3] smbd/password.c:register_vuid(276)
  UNIX uid 65534 is UNIX user nobody, and will be vuid 133
[2006/03/16 13:51:43, 3] smbd/process.c:process_smb(1114)
  Transaction 4192 of length 92
[2006/03/16 13:51:43, 3] smbd/process.c:switch_message(900)
  switch message SMBtconX (pid 9003) conn 0x0
[2006/03/16 13:51:43, 3] smbd/sec_ctx.c:set_sec_ctx(288)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2006/03/16 13:51:43, 3] smbd/service.c:make_connection_snum(477)
  Connect path is '/var/tmp' for service [IPC$]
[2006/03/16 13:51:43, 3] lib/util_seaccess.c:se_access_check(250)
[2006/03/16 13:51:43, 3] lib/util_seaccess.c:se_access_check(251)
  se_access_check: user sid is S-1-5-21-2957750683-620060279-44140246-501
  se_access_check: also S-1-5-21-2957750683-620060279-44140246-514
  se_access_check: also S-1-1-0
  se_access_check: also S-1-5-2
  se_access_check: also S-1-5-32-546
  se_access_check: also S-1-5-21-2957750683-620060279-44140246-132069
[2006/03/16 13:51:43, 3] smbd/vfs.c:vfs_init_default(215)
  Initialising default vfs hooks
[2006/03/16 13:51:43, 3] lib/util_seaccess.c:se_access_check(250)
[2006/03/16 13:51:43, 3] lib/util_seaccess.c:se_access_check(251)
  se_access_check: user sid is S-1-5-21-2957750683-620060279-44140246-501
  se_access_check: also S-1-5-21-2957750683-620060279-44140246-514
  se_access_check: also S-1-1-0
  se_access_check: also S-1-5-2
  se_access_check: also S-1-5-32-546
  se_access_check: also S-1-5-21-2957750683-620060279-44140246-132069
[2006/03/16 13:51:43, 3] smbd/sec_ctx.c:set_sec_ctx(288)
  setting sec ctx (65534, 65534) - sec_ctx_stack_ndx = 0
[2006/03/16 13:51:43, 3] smbd/service.c:make_connection_snum(662)
  acerjls (192.168.250.81) connect to service IPC$ initially as user 
nobody (uid=65534, gid=65534) (pid 9003)


I see that this xp pro don't sent the login/password no ?

thanks for your help