Ok so here's the deal: My vanilla server is pretty much all set to go. When I access the server via localhost, everything works great. I'm fairly certain that I did the port forwarding correctly. I downloaded a third party port checker, and it was able to ping my router, and it told me that port 25565 is "OPEN on this computer." However, when I try to access my server via my ipv6 (which I will be giving to someone else so they can access my server), I get an error. I have tried with ":25565" at the end and without. I will write the errors below this. I have done all I can, and I feel so close to being done, except for this one hitch. Can anyone help?
I also noticed that my third party checker gave me my external IP address. Minecraft should use my internal, right? I dunno if that makes any difference.
Error with ipv6:
java.net.SocketException: Protocol family unavailable
Error with ipv6 + :25565
Unknown host