Your Site Could Not Complete a Loopback Request: How to Read the Error and Fix It on Shared Hosting

A failed loopback request means WordPress could not reach its own wp-cron.php with a ten-second POST. The code printed under the label is the diagnosis: a cURL error means nothing answered (DNS, firewall, network), a status code means your own server refused (Cloudflare, ModSecurity, a deny rule, or the entry-process ceiling).