Basically your internet router has a built in firewall. By default, it blocks a whole bunch of incoming connections because, well, that’s security. Turns out you want to play Quake, and you find out you need to forward a port so that you can connect to a Quake server. If you don’t forward the port, it is impossible to create a connection and you cannot play.
[https://portforward.com/quake/](https://portforward.com/quake/)
This is just an example, but you might need to do so with your streaming software, your discord, etc.
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