Expiring user passwords fails after first expiry

Hi I am using openLDAP 2.3.32 on RHEL 4.0. I have configured openLDAP for password expiration. The system is still under testing phase. Created the basic password policy with dn: cn=basicPwdPolicy,dc=avaya,dc=com cn: basicPwdPolicy objectClass: device objectClass: pwdPolicy objectClass: top pwdAttribute: 2.5.4.35 pwdMaxAge: 180 pwdMaxAge is set to 3 minutes just for testing. And set the above policy as the default policy in slapd.conf file. Whenever I create a new user, it is prompted for a password change after first 3 minutes are expired. and when the user changes his password, he is never prompted for a password change ever again. It stays there forever. Not sure why it fails to do it again. If anyone can guide me, it would be indeed of great help. Thanks, Vikrant