How do I set up a LetsEncrypt free SSL certificate?
You can either use and test Centmin Mod 123.09beta01's addons/acmetool.sh See the first 10 posts outlined at Letsencrypt - Official acmetool.sh testing thread for Centmin Mod 123.09beta01 | Centmin Mod Community, particularly post 1 - how to enable acmetool.sh detection during beta testing phase via persistent config file /etc/centminmod/custom_config.inc variable LETSENCRYPT_DETECT='y'(details here) posts 6 - addons/acmetool.sh Integration into Nginx Vhost Routines - Part 1 posts 7 - addons/acmetool.sh Integration into Nginx Vhost Routines - Part 2 Or use your own chosen letsencrypt client and manually setup Letsencrypt ssl certificate like @Derek did with certbot official letsencrypt client at Letsencrypt - certbot letsencrypt ssl certificate install | Centmin Mod Community For for manual setup of SSL certificate, you can follow all steps outlined at Nginx SPDY SSL Configuration which are still valid (exception is you do not need to create the ssl settings themselves as 123.08 stable and higher auto generate those when you answer yes to self-signed ssl creation during centmin.sh menu option 2 otherwise you need to manually create the ssl vhost too) and references HTTP/2 changes needed. You just need to do the unified file and file concatenation of your SSL providers provided files if you said yes to self-signed ssl cert creation. If you answered no, you need to manually setup the HTTPS vhost configuration.