Samba server

[beloge2002]

Hi,
I am working on a samba server which I setup as PDC on my network. I can join all my XP pro on the domain, I can access to shared docs on samba server using login and passwd. My problem is that I can't login session to the domain but it seems to recognize credentials but the system shutdown automaticaly with blue screen. It seems to block while preparing account settings.
Here is my smb config:

[global]
 workgroup = ub
 netbios name = serveurweb
 security= user
 encrypt passwords = yes
 time server = yes

 # Option de connection
 socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

 # Configuration des logs du serveur
 log file = /var/log/samba/%m.log 

 #option LDAP
 passdb backend = ldapsam:ldap://127.0.0.1
 ldap suffix = dc=ub,dc=edu,dc=bi
 ldap machine suffix = ou=Machines
 ldap user suffix = ou=Users
 ldap group suffix = ou=Group
 ldap admin dn = "cn=Manager,dc=ub,dc=edu,dc=bi"

 ldap ssl = no
 ldap passwd sync = Yes
 enable privileges = Yes


 os level = 66
 domain logons = yes
 domain master = yes
 preferred master = yes

 wins support = yes
 dns proxy = no 

 name resolve order = lmhosts wins host bcast 

add user script = /usr/sbin/useradd -d /home/samba/home/%u -G Domain Users -s /bin/false -m %u 

add machine script = /usr/sbin/useradd -d /dev/null -G Domain Computers -s /bin/false -m %m$ 

 template shell = /bin/false
 winbind use default domain = no

[netlogon]
comment = NETLOGON service
path = /home/samba/netlogon
locking = no
public = no
writable = no


[profile]
path = /home/samba/profiles
read only = yes
browsable = yes

[public]
path = /home/samba/public
comment = Répertoire Public
create mask = 0774
directory mode = 0775
force directory mode = 0775
browsable = yes
writable = yes
vfs objects = recycle
recycle:keeptree = Yes

Could someone tell me what is going wrong with my config?
Thank you in advance.

[beloge2002]

Please, I need a help, i am stuck on it since more than a month!

[beloge2002]

Hi everybody,
I have already found that the problem is coming from LDAP because when I use :

 passdb backend = tdbsam

, it open normaly the session.
Is there someone who can tell me why? I thought account already created on Ldap and smbpasswd done, I can login in domain from any PC.