There are numerous threads on this same issue, which I know because I've read a lot of them, but nothing's worked so far.
I had a Debian modded Minecraft server that ran fine apart from a horrendous tickrate (running AllTheMods 3 Remix and GregTech: New Horizons), so a friend gave me an old computer with better hardware to upgrade it. I took the hard drive out of the old computer and put it into the new one, which I expected to cause problems but none that would take this long to fix.
I get io.netty.channel.abstractchannel$annotatedconnectexception whenever I try to connect to the server through a public IP now (local works fine). I have:
- Opened the port 25565 on my router and server computer
- Checked my firewall on the client computer allows the application
- Tried changing settings with iptables
- Tried using wireless connection instead
- Making sure the IP in server.properties is blank
- Checked my Java installation
OpenJDK Runtime Environment (build 1.8.0_302-8u302-b08-1~deb9u1-b08)
OpenJDK 64-Bit Server VM (build 25.302-b08, mixed mode)
I'm 99% sure this is a server problem, I can't recall exactly what I did in iptables so it might be related to the firewall, but I'm out of ideas.
EDIT: I think the problem might be that the port got opened incorrectly somehow, gonna try to change router settings in a bit. Trying to telnet to the server ip with port 25565 couldn't connect either. 25565 shows up at listening while using the ss -l command, but netstat -l doesn't seem to show it.
