"io.netty.channel.abstractchannel$annotatedconnectexception connection timed out" error when hosting 1.12.2 Forge server with PlayIt.gg

[/u/HalogenHalcyon]

Hello everyone! Recently I have been attempting to host a 1.12.2 Modded Forge server from a Debian laptop. Things are running smoothly so far, but one friend has been running into the aforementioned error. My firewall seems to not be the problem, and I'm not sure what else I could try. I've given him the full Modrinth instance to fresh install a few times, along with changing addresses to see if that works and it has not. He has also attempted updating Java to the newest version and flushed his DNS.

Any advice?

submitted by /u/HalogenHalcyon
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