Cron does not work for ldap users.

I Think the problem is related to Bug 448016: su does not work in 5.2

Starting nscd does not solve the problem, as it does with bug 448016.

We've also experienced bug 448016: su does not work in 5.2, and we've applied
the workaround with nscd, and now su works with ldap users.

But cron still does not work with ldap users.

Here is out /etc/pam.d/system-auth:
#%PAM-1.0
# This file is managed using cfengine
# User changes will be destroyed the next time cfagent is run.

auth        required      /lib/security/$ISA/pam_env.so
auth        sufficient    /lib/security/$ISA/pam_unix.so likeauth nullok
auth        sufficient    /lib/security/$ISA/pam_ldap.so use_first_pass
auth        required      /lib/security/$ISA/pam_deny.so

account     required      /lib/security/$ISA/pam_unix.so
account     required      /lib/security/$ISA/pam_ldap.so ignore_unknown_user
ignore_authinfo_unavail

password    required      /lib/security/$ISA/pam_cracklib.so retry=3 type=
password    sufficient    /lib/security/$ISA/pam_unix.so nullok use_authtok md5
shadow
password    sufficient    /lib/security/$ISA/pam_ldap.so use_authtok
password    required      /lib/security/$ISA/pam_deny.so

session     required      /lib/security/$ISA/pam_limits.so
session     optional      /lib/security/$ISA/pam_unix.so
session     optional      /lib/security/$ISA/pam_ldap.so


,and our /etc/pam.d/crond file:
#
# The PAM configuration file for the cron daemon
#
#
auth       sufficient pam_rootok.so
auth       required   pam_env.so
auth       include    system-auth
account    required   pam_access.so
account    include    system-auth
session    required   pam_loginuid.so
session    include    system-auth

Thanks