Hi everyone,
Today i have a problem with HTTPS, i tried config HTTPS like link below and my result is "400 Bad Request No required SSL certificate was sent"
I tried check error log and just receive error "Signal process started". I have sent attach file config in post, please help me. Thanks you very much

https://www.digitalocean.com/community/tutorials/how-to-host-a-website-using-cloudflare-and-nginx-on-ubuntu-16-04