You don’t have to put the full URL into the UAM allowed field. Only the domain name.

You have to enter the full URL in the Control Center, under Manage > Locations > Click on name > Modify Hotspot Data > SET CUSTOM SPLASH PAGE (WALLED GARDEN).

The instructions in the knowledgbase says:

Quote:
In the UAM allowed field, enter: http://www.yoursite.com (your domain where your special page is hosted, ONLY THE DOMAIN NAME!)