Cisco, RADIUS , LDAP Authentication Problem

GlacierHi all, I'm currently running redhat linux 3 ES with kernel-2.4.21-27.EL openldap-2.0.27-17, and freeradius-1.0.1-1.RHEL3. I dont have a problem authenticating RADIUS against LDAP but the major problem is RADIUS is ignoring LDAP Expiration date for unix Accounts; what causes this?