Webaccess and expired password

We currently have a Groupwise 18.0.1 email system setup with LDAP authentication to our eDirectory with bind. We have a problem when a users' password expires they can still log into the Groupwise via the Web access. I can disable the account and it does prevent the user from logging in. Any thoughts on what to look at to make the webaccess not let people login when their password has expired?