Am I on my own on this? I'm guessing no one else knows what's causing this.

After looking at my logs again, the issue you're referencing is after the client-server disconnect issue I'm having. The stdin fail is happening after I've pressed Ctrl-C to stop the server. The point where I'm having the connection drop is right before the Received SIGINT, shutting down. This is ...

You're link references Docker, but I'm not using that. I don't know what stdin is or how it closed. Why would this allow me to play initially and then make the server crap out after relaunch?

Here's the server log:
And here's the client log:
Let me know what else I can provide. I just ran these about 5 minutes ago.

I have searched everywhere and there is no help for us Mac users. So now I'm gonna try here.

I've managed to set it all up and get it running. Problem is, it doesn't consistantly work. When I have a clean install of Factorio on my Mac Mini(which I'm using as a server), I set up a headless server ...