[Samba] problems includind a samba server in a 2003 network

[Pierre Le SIDANER]

Hello I am brand new on samba server
I am trying to put a samba server in a windows 2003 domain
the autentification have to be done by the 2003 AD, and my configuration 
does not work

my samba version is samba-3.0.10-1 on redhat
as i try to access samba server from a xp on the domain it does not work

i have try to access the pdc with ads "laurel" with net join from the 
samba server
with an acount Pierre_admin on the AD witch is administrator
and it does not work

[root at silvacane etc]# net join -S laurel.obspm.fr -U Pierre_admin%toto
[2005/01/04 16:25:43, 0] libads/kerberos.c:ads_kinit_password(146)
  kerberos_kinit_password Pierre_admin at SERVICES.OBSPM.FR failed: Cannot 
find KDC for requested realm
[2005/01/04 16:25:43, 0] utils/net_ads.c:ads_startup(186)
  ads_connect: Cannot find KDC for requested realm
[2005/01/04 16:25:43, 0] rpc_client/cli_netlogon.c:cli_nt_setup_creds(256)
  cli_nt_setup_creds: request challenge failed
[2005/01/04 16:25:43, 0] rpc_client/cli_netlogon.c:cli_nt_setup_creds(256)
  cli_nt_setup_creds: request challenge failed
[2005/01/04 16:25:43, 0] utils/net_rpc_join.c:net_rpc_join_newstyle(319)
  Error domain join verification (reused connection): 
NT_STATUS_INVALID_COMPUTER_NAME


I give you my smb.conf config, thank you for some help
[global]
workgroup = SERVICES
server string = Samba test pierre
netbios name = test_pierre
printcap name = /etc/printcap
load printers = yes
log file = /var/log/samba/smbd.log
max log size = 500
security = ADS
 password server = laurel.obspm.fr
 encrypt passwords = yes
 add machine script = /usr/sbin/useradd -d /dev/null -g 100 -s 
/bin/false -M 
%u                                                                            
 
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
 
   dns proxy = no

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                           Pierre Le Sidaner 
             Observatoire de Paris-Meudon-Nancay 

Service Informatique de l'Observatoire 01 45 07 76 33 
Observatoire Virtuel 01 40 51 20 89 

mail:pierre.lesidaner at obspm.fr 

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