523 — Origin is unreachable

523 — Origin is unreachable

Domain : Cloudflare

What does this error mean?

Cloudflare cannot reach the IP address configured for the origin.

Where can it appear?

This error may appear in application logs, client messages, monitoring systems or protocol traces. Keep the complete timestamp, request context and surrounding events before troubleshooting.

Likely causes

Origin web server availability or performance
Firewall or routing between Cloudflare and the origin
Invalid or delayed HTTP response from the origin

Checks and resolution

Test the origin directly when possible
Review web server, PHP/application and firewall logs
Confirm DNS

Caution : Avoid disabling security or proxying permanently before the origin cause is understood.