Hey,
I'm port forwarding a forge server, and I'm certain that everything is set up network wise. My friends are using my current public IP, everything is configured correctly in my router, and portchecker.co and canyouseeme.org both say that my ports are open. The problem started yesterday. Nobody was able to connect to my server, it just idled at the logging in screen and kicked them for being timed out. I'm able to connect to the server just fine, through either localhost or by using my public IP. I had already allowed java to go through the firewall, so I allowed the TCP and UDP ports through the wall to no avail. My MC username is Skyfire175 and my friend's MC username is Vornado_ The error in which he couldn't log in is around the bottom.
https://pastebin.com/p8Bd1EdY