I have my website setup properly in CF for DNS and it has been running well for a month. Yesterday I started getting reports that the site was down. I checked DNS via 3rd party tool https://dnschecker.org (Google, OpenDNS etc) and the results come back with:
The first one is valid and if hard coded on a local machine works fine, the second results in a 521 error. I verified the UFW firewall is off on the host, this appears to be a CF internal problem. Toggled the CF proxy option, toggled developer mode, there are no page rules or firewall rules. Can anyone give me any suggestions to resolve this? Thank you.