5xx Server error · unofficial (Cloudflare)

523 Origin Is Unreachable

Cloudflare can't reach the origin server at all.

What 523 means

A routing or DNS problem: the origin's IP is wrong or unreachable from Cloudflare.

Common causes

Incorrect origin IP in Cloudflare DNS.
Network routing problems at the host.

How to fix it

If you're calling an API

Retry later.

If you run the server

Verify the origin IP in Cloudflare's DNS settings and contact your host.

Should you retry?

Later.

Example response

HTTP

HTTP/1.1 523 Origin Is Unreachable
Content-Type: application/problem+json

{
  "type": "about:blank",
  "title": "Origin Is Unreachable",
  "status": 523,
  "detail": "Cloudflare can't reach the origin server at all."
}

Defined in: Cloudflare (non-standard). 523 is a server error: the problem is on the server's side.

Debugging an API call? Convert your request with the cURL converter, check the response with the JSON formatter, or see whether the API is down on its status page.

HTTP 523 FAQ

What does HTTP 523 mean?

523 Origin Is Unreachable: Cloudflare can't reach the origin server at all. A routing or DNS problem: the origin's IP is wrong or unreachable from Cloudflare.

Is 523 a client or server error?

It's a server error (5xx): the server failed to handle a valid request, so the fix is usually on the server's side.

How do I fix a 523 error?

Retry later.

Should I retry after a 523?

Later.

Other 5xx status codes

All HTTP status codes