I wanted to play with my friend, so i`ve loaded my world, opened it for LAN, gave him the port. He copied my ipv4, entered it with port as needed, tried to join the server but the loading never ended. It said "Connecting to the server" and then just crashed. We did the same on his server and the same thing happened.
Strange thing is that yesterday we both played on our other friend's server and everything worked properly.
We did the thing with disabling firewall but nothing changed.