My friend is on a macbook and I'm on a PC, and they've been unable to connect to any LAN world, vanilla or modded, for a few months now. We used to play skyfactory 3 together all the time, but we've been trying all day to connect in the next installment, Skyfactory 4, and it hasn't been working. They always appear in the world for a few seconds, and are automatically disconnected with an error message saying either "Disconnected" or "Timed out."
We've tried all kinds of different network configurations, including straight up directly connecting the computers with an ethernet cable, and I've tried disabling my firewall. We're going to try disabling their firewall after skyfactory reboots (again) and see what hapens. Has anyone else with this problem figured out how to fix it?