What Ports are usually open for public wifi locations

[JackGreen]

Ones that let in udp

[paintball9]

should basically be all ports unless there is a proxy in which case it will depend on what they choose to set it at. could be anything from only 80 (http) to all of them. There is no way to check from our end what is open at your location you're just gonna have to use trial and error and see what works.

[Switeck]

Chances are, they're all closed incoming. UPnP is only remotely likely to work.

In short, they will almost certainly all be firewalled.

Even some outgoing ports may be blocked, those depend on the public wifi setups.