This concerns Crossplay over LAN.

Windows Firewall on my PC seems to stop my friend from joining my world. He's on xbox. I can easily join his world when the Xbox is the Host but when my PC is host he cant join me because Firewall is blocking it.

If I disable Firewall, he gets in to my world. However, I feel vulnerable so how can I allow his xbox through my Firewall without having to disable it?

Is Minecraft Windows 10 Edition using a special Port that I have to open?

I'm on Windows latest Falls Creator Update (FCU). I didn't have this problem before this update so maybe Firewall got a bit stricter.