/me sighs. It seems like I can only port forward my internal IP address (192.168.0.10). So dumb. I'm running a Cisco DPC3825 router. For some reason, even if I port forward with my internal ip address, people that aren't in my network can still connect to my Bukkit server! @DanielHeppner can confirm this. Apparently, my IPV4 address is 192.168.0.10. But when I go to canyouseeme.org, it says my IP is 220.127.116.11. So I tried to port forward 192.168.0.10, and it worked. Then I tested 18.104.22.168. And this error came up: Help me please! Thanks!