Login not for all users

Hello,

I have a Ldap Server running and every user can logon to the server.
Formerly only users with a valid shell could log on, but since I use
ldap every user can logon. Theres an attribute loginShell for that user,
that consists "/bin/false" but this is not used. Every user who tries to
login get a shell.

If I do "getent passwd" there is nothing shown, where normally the field
for the shell is:
user:x:1002:513:System User:/home/user:

Whats wrong?

Suse 9.0
Openldap 2.1.22

Best regards
Marc