Starcraft 2 - how to open firewall port?

SC2 installs fine with Lutris and runs fine in the menu screens. But play is disabled, saying “not available while initializing game mode”. A Google search says this might be due to the firewall blocking the game.

On Windows this gave a little network popup you could accept. How do I let Ubuntu/Linux know to let SC2 connect in the same way please?

(I’m running Lutris through Flatpak. ChatGPT said it couldn’t help me because of this)

Never mind, I just turned it off and on again and everything works