Hello, I have recently deployed my Ruby on Rails application to a plain Ubuntu 16.04 droplet with Nginx, passenger & Let's encrypt. The rails app worked fine without Let's encrypt but as soon as I installed it, I can'...

I have been trying to deploy my rails application for a good part of this week now and have tried many, many, many times to try and get this working. I either hit a 502 bad gateway, a 504 gateway timeout or the page s...