Cloudflare is disabled, i only use their DNS.
Finaly could grab the error:
2017/10/15 18:28:48 [error] 3332#3332: *94 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 7x.27.1x4.xxx, server: ******.com, request: "GET / HTTP/2.0", upstream: "fastcgi://unix:/run/php/php7.0-fpm-voz.sock", host: "******.com", referrer: "https://******.com/"