[Samba] poisx in ldap and smbpasswd backend : get_md4pw: Workstation station$: no account in domain

[FM]

Hello,

I migrate posix users in ldap (nss_ldap).

but now,
if I join a windows station to my SAMBA 2 domain from my windows xp station:
everything seems ok : user add to the local /etc/passwd and the windows 
welcomes me in the domain

but after the reboot and when I try to connect :
on the windows XP  : Domain password server not available
nad in the log of SMb :

get_md4pw: Workstation station$: no account in domain






my global in smb.conf :

[global]
   add user script = /usr/sbin/useradd -d /dev/null -g 100 -s /bin/false 
-M %u
   netbios name = SERVER
   workgroup = DM
   server string =  SAMBA PDC
   hosts allow = 192.168.4.
   load printers = no
   ; printing = lprng
   ; guest account = pcguest
   log file = /var/log/samba/%m.log
   max log size = 50
   security = user
   ; password server = <NT-Server-Name>
   ; password level = 8
   ; username level = 8
   encrypt passwords = yes
   smb passwd file = /etc/samba/smbpasswd
   ; invalid users = bin daemon adm lp sync shutdown halt mail news uucp 
operator games gopher ftp nobody ixfs httpd
   ; ssl CA certFile = /usr/share/ssl/certs/ca-bundle.crt
   unix password sync = no
   ;passwd program = /usr/bin/passwd %u
   ;passwd chat = *New*password* %n\n *Retype*new*password* %n\n 
*passwd:*all*authentication*tokens*updated*successfully*
   ;pam password change = yes
   ; username map = /etc/samba/smbusers
   ; include = /etc/samba/smb.conf.%m
   obey pam restrictions = yes
   socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
   ; interfaces = 192.168.12.2/24 192.168.13.2/24
   ; remote announce = 192.168.1.255 192.168.2.44
   local master = yes
   os level = 33
   domain master = yes
   preferred master = yes
   domain logons = yes
   ;logon script = %m.cmd
   ; logon script = %U.bat
   ; logon script = soft_inventory.cmd
    logon path = \\SASSARI\%U\profile
    logon drive = Z:
    logon home = \\SASSARI\%U
   ;  wins support = yes
   ;  wins server = 192.168.4.29
   ; wins proxy = yes
   dns proxy = no
   ; preserve case = no
   ; short preserve case = no
   ; default case = lower
   ; case sensitive = no
   create mask = 0775
   directory mask = 0775
   interfaces = eth0 192.168.4.10/255.255.255.255
   bind interfaces only = True
   #client code page = 437
   character set = ISO8859-1
   ; debug level = 2
   domain admin group = @root
   #profile acls = yes