Captive Portal

In the AirLink GX450 V4.4 there was a setting for a landing page. In the version 4.8 and above it no longer exists. Does anyone know how to configure the Captive Portal so that customers are directed to a specific URL. When the landing page was an option you just enabled it and added the URL. I tried the same modification for Captive Portal, enabling it and adding the URL but once this is done I can no longer browse the web.