CloudFlare SSL refused on HTTP access

问题

I not use CloudFlare SSL , but use LetsEncrypt in my webserver nginx.

I'm trying to disable ssl cloudflare default, but not work. Website when access http://example.com result on "Connection refused" and when accesss with http://www.example.com shows

Error 521 Web server is down

What i have to do? thanks

来源：https://stackoverflow.com/questions/43219932/cloudflare-ssl-refused-on-http-access