I tried to make a modded forge server for 1.7.10 and for me and a
friend and I actually get it running, but when i try to connect via my
IPv4 adress, it says "the authentication are currently down for
maintenance". Interestingly, when i try to login with my IPv6 adress, it
says "protocol family unavailable", and I don't even know what that
means. Does somebody have an idea on what the issue here could be?