samba - Sep 2007 - Samba user Modify passwords on Windows 2003 Enterprise

Hi

I have installed a Samba/Openldap serveur for my domain. All user under
Windows XP can modify their password and all user under Linux can also
modiy their password. But all user on Windows 2003 serveur (with TSE)
can't modify password, the messages is the serveur can't find my domain.

thank for your help