Popup control window

Question

Why should not the user close the popup control window which seem after the authentication along with the Captive Portal?

Answer 1

Because this window, other than letting forced disconnection by the user, guarantees the continuous renewal of the authenticator before this expires. If this window is closed the gateway, which no longer sees any requests for renewal, will decide to close the client connection.

It is possibly already evident that till a gateway renews an authenticator, the latter have to be still valid. Therefore the renewal prolongs the life of an authenticator which has still to expire.