Cloudflare

Does cox block or limit Cloudflare's IPs located at https://www.cloudflare.com/ips on residential service?

I have been in contact with Cloudflare about recieving a 522 Timeout error upon trying to reach my site. I can reach the site perfectly via the IP it just doesn't work through cloudflare. They sent me the following;

A 522 (https://support.cloudflare.com/hc/en-us/articles/200171906-Error-522) happens when a TCP connection to the web server could not be established. To initiate a TCP connection our edge server sends out 3 SYN packets and awaits a SYN-ACK packet in return, if it doesn't receive one within 15 seconds the connection attempt will fail.

Common reasons for us to not receive the SYN-ACK in return: 
- Our connection attempt was blocked by a firewall/security plugin at the host 
- Packets are being dropped within the host's network 
- The origin server was too overloaded to respond 
- There was an issue with an upstream provider along the path

Here is what I recommend in order to ensure CloudFlare's IPs are accepted by your server: 
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 below: 
3. Make sure that you're operating off of the most recent versions of Bad Behavior or mod_security. mod_security's core rules aren't blocking CloudFlare requests.

Here is a list of our IPs: https://www.cloudflare.com/ips

I have checked everything on my end and it all works. If anyone could shed some light I would be thankful.