Minecraft - Friends Can't Join Server (Solution)

There are only two reasons your server is not working if you have default settings.
Number one: Your firewall/PC is blocking the connection
Number two: Your port is not open meaning your port forwarding is not working.
Check with this link to see if your port is open https://www.yougetsignal.com/tools/open-ports/

Solution one: Open your internal and external ports in your firewall on your pc.

Solution two: Make sure your port is open (Server has to be running while checking) and if it is closed then you did your port forwarding wrong. My solution was instead of doing a single port forward, I selected a range port forward.

Other solutions I have not tested:
I have seen a couple of articles saying that your routers firewall may be the issue and some setting would need to be changed to allow port forwarding.

Видео Minecraft - Friends Can't Join Server (Solution) канала DundyDunker