524 Error for one users, but not others

Website, Application, Performance
1

What is the name of the domain?

What is the error number?

Error code 524

What is the error message?

A timeout occurred

What is the issue you’re encountering

One user can’t access the site. Has tried multiply times over a span of days.

What steps have you taken to resolve the issue?

User sent RAYID, but can’t find it using the dashboard. I disabled some custom rules, restarted the web server. Send the user a custom link to try with no luck.

What are the steps to reproduce the issue?

Not sure, I’m not aware of any other users having issues.

2

Hello, error 524 usually indicates that Cloudflare successfully connected to the origin web server, but the origin did not provide an HTTP response before the default 100 seconds Proxy Read Timeout. This can happen if the origin server is taking too long because it has too much work to do, for example, a large data query, or because the server is struggling for resources and cannot return any data in time.

Error 524 can also indicate that Cloudflare successfully connected to the origin web server to write data, but the write did not complete before the 30 seconds Proxy Write Timeout (or 6.5 seconds in the case of Cloudflare Images).

Note

A 524 occurs if the origin web server acknowledges (ACK) the resource request after the connection has been established, but does not send a timely response.

Resolution

Here are the options we’d suggest to work around this issue:

  • Implement status polling of large HTTP processes to avoid hitting this error.
  • Contact your hosting provider to exclude the following common causes at your origin web server:
    • A long-running process on the origin web server.
    • An overloaded origin web server.
3

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