Um.. what if the OS is mac? I tried your suggestion, but it hasn't worked. Maybe a video showing this may help. Thank you my good sir.
Can you post a screenshot of your server list in the launcher? Also of your server's settings tab? That should help diagnose the issue.
Sorry for being such a noob on the forums, I have the pics, but I don't know how to post them onto the forums. I tried making the server code or address 127.0.01:4237, the main port 4237, and the build port 4238. Thanks for the help my good sir.
Everything looks good except for the fact that your server isn't running. Did you uncheck the "Auto-start server on startup" checkbox on purpose? If so, you need to click on "Start".