Error Code Portal
CloudflareCloudflare HTTP errorsError code

523

Error 523: origin is unreachable

Alternative forms: Error 523

What does this code mean?

Code 523 · An issue reported by Cloudflare HTTP errors.

Official explanation · Original text

This error occurs when Cloudflare cannot contact your origin web server. This typically occurs when a network device between Cloudflare and the origin web server does not have a route to the origin's IP address.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Error 523: origin is unreachable ↗

Creator: Cloudflare, Inc. and contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Selected introductory official description; Markdown stripped; original Korean product context added. Direct official error page retains the complete cause and resolution instructions.

Source details · Original licenses and notices