Before we startIn order to follow this guide, I assume you already have a VPS and facing an intranet situation which you can't expose a port to the public. If you have extranets, DDNS is more suitable for you. I will use a Ubuntu 18.04 machine for this guide. The command line will differ among different machine types. Make sure you fully aware of that. So, Let's dive right in.Install NPSUse any of your favorable SSH clients to connect to the V...