Wifi bars on but browser says no internet connection detected

I am on my school network and although when I log on, I get all bars on the wifi icon blacked in, my browsers all say that there is no internet connection detected. What should I do?

There my be an Acceptable Use Policy that you have to accept before using the network. Turn off your wifi, then turn it back on and reconnect. Then open your default web browser, to see if anything pops up.

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