A 521 is covered at Community Tip - Fixing Error 521: Web server is down and basically means your server refused the connection.
Are you sure you have the right IP address configured on Cloudflare? Would it be the one ending in 62?
A 521 is covered at Community Tip - Fixing Error 521: Web server is down and basically means your server refused the connection.
Are you sure you have the right IP address configured on Cloudflare? Would it be the one ending in 62?