Failed authorization procedure on CentOS 7

Server
1

I ran letsencrypt certonly --standalone ony my CentOS 7 vm to try and renew my certificate for my domain, cooperpellaton.com. I recieved the following error:

Failed authorization procedure. cooperpellaton.com (tls-sni-01): urn:acme:error:tls :: The server experienced a TLS error during domain verification :: Failed to connect to host for DVSNI challenge

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: cooperpellaton.com
   Type:   urn:acme:error:tls
   Detail: Failed to connect to host for DVSNI challenge
[root@webhost ~]# letsencrypt certonly --standalone

I am using ClouldFlare, but I’ve removed any instance of CloudFlare serving/connecting over SSL as well as putting the site into development mode and removing any challenges to access.

2

Are you sure that there’s no firewall or firewall rule blocking inbound connections to port 443 on that machine? And are you sure that the DNS records are up to date and fully propagated so that nobody could have old DNS records stlil cached that point somewhere else?