GoDaddy to Cloudflare to Host

[michael]

When you set the DNS to this is perfectly normal. The connection from the user go to Cloudflare, and then Cloudflare go to your origin.

You probably have a firewall in place on your Origin, as Cloudflare cannot connect to your origin, which is why you are getting the 521 error. Check out the related CommunityTip

Community Tip - Fixing Error 521: Web server is down

Error Try the suggestions in this Community Tip to help you fix Error 521: Web server is down. Background A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request. [Banner in tip catalog] Quick Fix Ideas …