Names the TCP Redirect Group used for 'advertising captivation' — a redirect shown to subscribers for advertising purposes, separate from the login redirect. This lets an operator monetize already-authenticated or passed-through traffic by periodically redirecting it to an ad page, independent of the initial login redirect group, so login and advertising can point at entirely different destinations and be toggled independently. A free ad-supported Wi-Fi service would set cssgCfgTcpRedirGrpForAdvCapt to a group pointing at a rotating ad server, so a logged-in user's web request is occasionally intercepted and shown a sponsor page.