Support for ports other than 80 and 443

[eva2000]

@Rahff

Also, I prefer not to use the webroot method because I have a lot of subdomains to authenticate and some of them are not even used in nginx, but for a mail server.

if you use nginx you can also setup a default server to handle LE SAN SSL multi-domains outlined at Using the webroot domain verification method - #7 by Leliana. I did this for testing at https://community.centminmod.com/posts/20018/ as well. So you could do it this way for mail server and none http/https facing server subdomains etc