I know what I am doing. I know how to port forward. Port forwarding for Blockland worked just fine, and yes, it was before the port forwarding not required update.
Only idiots get "hacked" through ports or whatever.
I tried setting my IP to blank, 127.0.0.1, 192.168.1.64(My LAN IP), normal IP. I tried ports 25565,28000,28001.
I can connect fine, other people can't.
And these port checker things don't work for me even when my ports are open.
My problem is that the server assigns unforwarded ports to clients, instead of taking lower ports I have forwarded. It assigns even higher port #s to people if I forward bigger range of ports.