samba - Sep 2005 - ACL and user list on windows XP

Hi,

I try to setup a simple file sharing with some ACL for a group of users.
My Samba 3.0.14 server is running on Fedora Core 4 using pam_ldap.
User authentication works correctly with ldap and my nsswitch is 
correctly configured to use the ldap as "extended list" of users and
groups.
For exemple, when I type getent passwd or group, I have the complete 
list of system users and ldap users.

Here is my problem :
Why I try to change ACL  for a file the Security tab on Windows, I can't 
list any users (system or ldap).
Windows asks for a login/password when I click on "Search" and
doesn't
return anything but local accounts.
However, I think my SID are correctly setup in my ldap because the owner 
of the file is correctly resolved.

I don't know if the problem is Windows or Samba or Linux related, if 
someone could put me on a track, any help is appreciated

Thanks

Here is my smb.conf

[global]
        workgroup = DOMAINNAME
        os level = 65
        passdb backend = ldapsam:ldap://ldap.****.be
        passwd chat debug = Yes
        nt acl support = yes
        log level = 2
        log file = /var/log/samba/log.%m
        ldap admin dn = "****"
        ldap suffix = ****"
        ldap ssl = no
        ldap user suffix = "*****"
        load printers = no

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