I use Let's Encrypt on a NoIP domain (DynDNS) without problems, but my site is rather low traffic.I consider myself to be technically somewhat versed, but each quarter it is a guessing game as to which file goes where on a stock Apachefriends install. Yea, I should write this down rather than complain about it. The point is that tech stack providers and cert agencies do not make it easy enough to add a cert to a server. It's 2018, give me a GUI front end that has one button: Obtain and apply Cert. I click it, select the desired provider, pass some information on, confirm that the site to certify is mine, and then have the files applied. Want people to use stuff, then make it easy to use. Router admin UIs should do that automatically and leave the option to direct to a different cert repository if the user desires. Sadly, many companies these days throw devices on networks and have no clue about networking or security.