When to use Cloudflare Origin SSL?

You use Cloudflare Origin SSL certs in place of Letsencrypt SSL certs on Centmin Mod Nginx origin servers i.e. SSL - Cloudflare - Improving Cloudflare Connections To Origin Server - Use ECDSA SSL Certs

 

if you do any connections directly with Centmin Mod Nginx origin bypassing Cloudflare, you'd want Letsencrypt on Centmin Mod Nginx + Letsencrypt, otherwise Cloudflare origin ssl certs are fine.

 

either cloudflare origin ssl certs or letsencrypt + authenticated origin pulls

both types of certs do same thing just letsencrypt is web browser trusted if you need to bypass cloudflare and directly access centmin mod nginx origin

 

centmin mod letsencrypt supports ECDSA SSL certs optionally too from Letsencrypt - Official acmetool.sh testing thread for Centmin Mod 123.09beta01

see Letsencrypt - Official acmetool.sh testing thread for Centmin Mod 123.09beta01 just set KEYLENGTH='ec-256' in persistent config file at /etc/centminmod/acmetoool-config.ini or at /etc/centminmod/custom_config.inc and when you get your centmin mod letsencrypt ssl cert it will be ECDSA based instead of RSA 2048 bit based