I wanted to avoid VPN both for my main working/dev machine and clients. What if VPN does not go up after hard reboot due to some weird loading order while I'm not logged in (e.g. electricity failure)? Both that machine and Guacamole/NGINX host are configured to autostart after powering off. This is the first thing I tested. For clients, I do not want to have VPN on each of them. And what if I need to use a random machine? Multi-layer opaque https endpoint seems safe enough.