Se solicita Configuración CloudFlare en VPS de DonWeb (Ex Dattatec)

Estoy buscando a alguien que me de una mano con CloudFlare y un VPS de Dattatec.

Yo realicé la configuración básica de los DNS y apunté al dominio, pero me causa el siguiente error: https://support.cloudflare.com/hc/en-us/articles/200171916-Error-521

Es por ello que ando necesitando a alguien que sepa al respecto.

Muchas Gracias!

Esto lo has hecho:

2) Something on the web server or hosting provider's network is blocking CloudFlare's
requests. Since CloudFlare acts as a reverse proxy, all connections to your server come
from a CloudFlare IP. Since the same amount of traffic now comes from a smaller number
of IPs, server-side security solutions can mistake the increase in connections from this
smaller set of IPs as an attack, when they are legitimate.
As soon as you can identify what is blocking CloudFlare's requests, the issue will be resolved. Here are the four common places to look:

1. Make sure that you're not blocking CloudFlare IPs in .htaccess, iptables , or your firewall.
2. Make sure your hosting provider isn't rate limiting or blocking IP requests from
   the CloudFlare IPs and ask them to whitelist the IP addresses found here: www.cloudflare.com/ips
3. Make sure that you're operating off of the most recent versions of Bad Behavior or mod_security. You want to ensure that mod_security's core rules aren't blocking CloudFlare requests.
4. If you are running custom Apache modules, such as mod_antiloris and mod_reqtimeout, disable and unload the modules. These modules will block any time an IP that connects more than 22 times. Since all connections are now coming from a CloudFlare IP, you will definitely hit the limit causing the error page. As soon as you unload the module, the issue will disappear

Te mando mp amigo!