SERVER IS FUNCTIONING NORMALLY
If you receive “Failed: Other side closed connection” when logging in, you will need to update to the latest game version (from Download Early Access).
If you have problems connecting, make sure that your firewall isn’t blocking network traffic. Some firewalls automatically block traffic when in full-screen mode without displaying any prompts. Try again, this time running the game in a window (it’s an option in the “Graphics” menu).