Jonction au domaine

Bonjour,

je travail sur debian squeez 6.0 et je voudrais coupler mon serveur LDAP avec SAMBA.d'apré ma configuration smb.conf,une fois que j'esssais de faire la jonction du domaine sur une machine windows, une fenetre s'affiche me demandant le login et mot de passe d'un utilisateur ayant accés au domaine.Mais j'ai comme erreur "l'ereur suivante s'est produite lors de la tantativie de jonction au domaine "DOMAINE" : le domaine spécifié n'existe pas ou n'a pas pu etre contacté". Merci de m'aider, je compte sur vous.

voici le fichier smb.conf:

[global]
workgroup = DOMAINE
server string = Controleur de domaine
netbios name = institut
domain master = yes
local master = yes
domain logons = yes
client lanman auth = yes
client ntlmv2 auth = yes
lanman auth = yes
ntlm auth = yes
security = user
os level = 40
ldap ssl = off
ldap passwd sync = yes
passdb backend = ldapsam:ldap://127.0.0.1
ldap admin dn = cn=admin,dc=domaine,dc=sn
ldap suffix = dc=domaine,dc=sn
ldap group suffix = ou=Groups
ldap user suffix = ou=Users
ldap machine suffix = ou=Machines
add user script = /usr/sbin/smbldap-useradd -m "%u"
ldap delete dn = yes
delete user script = /usr/sbin/smbldap-userdel "%u"
add machine script = /usr/sbin/smbldap-useradd -w "%u"
add group script = /usr/sbin/smbldap-groupadd -p "%g"
#delete group script = /usr/sbin/smbldap-groupdel "%g"
add user to group script = /usr/sbin/smbldap-groupmod -m "%u" "%g"
delete user from group script = /usr/sbin/smbldap-groupmod -x "%u" "%g"
set primary group script = /usr/sbin/smbldap-usermod -g "%g" "%u"
logon path = \\%L\profiles\%U
logon drive = P:
logon home = \\%L\%U
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
case sensitive = No
default case = lower
preserve case = yes
short preserve case = Yes
dns proxy = No
wins support = Yes
winbind use default domain = Yes
nt acl support = Yes
msdfs root = Yes
hide files = /desktop.ini/ntuser.ini/NTUSER.*/

# Reglage de l'encodage des caracteres :
unix charset = iso-8859-15
display charset = iso-8859-15
dos charset = 850
#
[netlogon]
path = /home/dev/netlogon
writable = No
browseable = No
write list = Administrateur
#
[profiles]
path = /home/dev/profiles
browseable = No
writeable = Yes
profile acls = yes
create mask = 0700
directory mask = 0700
#
[homes]
comment = Repertoire Personnel
browseable = No
writeable = Yes
#
[partage]
comment = Repertoire commun
browseable = Yes
writeable = Yes
public = No
path = /home/partage
#
[printers]
comment = All Printers
path = /var/spool/samba
create mask = 0700
printable = Yes
browseable = No
#
[print$]
comment = Printer Drivers
path = /var/lib/samba/printers