I can't join the game on battle.net

Dear sir,
I can’t join the game on battle.net.
If I select the game on the custom games, The sentence"Unable to join game" shows up.
For your reference, I am using the wifi at the hotel.
Coud you help me how to play starcraft?

I think it’s a firewall or port issue on the public wifi.

please help me how to play with a friend over the network, I create a map but he cannot find me

Hi! If you’re trying to play using WiFi LAN have a look at this guide, even if it applies to W3:R:

You can try my solution here

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