WiFi Security Interview Question:

Why should not the user close the popup control window which appears after the authentication with the CaptivePortal?

Submitted by: Administrator

Because this window, other than allowing forced disconnection by the user, guarantees the continuous renewal of the authenticator before it 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 probably already evident that until a gateway renews an authenticator, the latter must be still valid. The renewal therefore prolongs the life of an authenticator which has yet to expire.
Submitted by: Administrator