Jowy

I am trying to host a dedicated server from my PC but none of my friends can join the server. It has been port forwarded already and the modpack I am using is ATM9 version 9-0.1.1.zip. There are a handful of errors like the title of this post, and I have tried other modpacks but they refuse to work. The modpack works on server hosting websites such as Host Havoc. part 1: https://pastebin.com/AAiq3MgU part 2: https://pastebin.com/QAX9Yusm