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No specific port, but it does need to know the password if you are using any type of security (and I'll assume you don't need to reconfigure the router to give client access -- if you do, the MAC address is on the settings page).
You are going in to Settings, WiFi Networks, scanning, picking a network and trying to connect, right? Not just thinking it's automatic (that only happens with AT&T hotspots in the US)....
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