An employee is trying to connect their company laptop to airport Wi-Fi.

Comprehensive and Detailed Explanation From Exact Extract:

Public Wi-Fi networks often usecaptive portals, which require accepting terms or authenticating via the pop-up page before full access is granted. Closing it prematurely stops full connection.

FromTravis Everett – All-in-One Exam Guide:

“Captive portals intercept the first HTTP request and present a login or acknowledgment screen. Without completing it, access is denied.”