PixelPusher

I followed the instructions that corrados provided and it brought up a headless server on my Ubuntu 18.4.3 VM, running in the DigitalOcean.com cloud. I can connect to it from my desktop, so I have it successfully running. The problem is that there are other people connecting to it, too. I don't know how they found out about it, but I really want to set this up so only my session group can get in. So, how do I make this private? There might be configuration options available in the GUI, but those...