need help with my own server
so. i have an agrarian skies server. and im trying to let my brother join. im already playing for a while and no problems. But as soon as he is looking in his server list it says that he can't reach my server.
I checked my IP and he has the right IP. we've accepted mojang in firewall. and all other kinds of stuff, but we cant seem to fix the problem.
I Hope that any of you know what the problem could be.