[CR #293905] Users who are already registered within Enterprise Security must still confirm their registration when using the portal for the first time. This may be the case if you are upgrading from an earlier version of Enterprise Portal.
Workaround: Enter the same name and password within the login portlet that is registered for you in Enterprise Security entitlement database (ACDB). The portal displays a registration page with the fields already filled with the users’ information. Click “I agree to the terms and conditions” to enter the portal.