How to fix web server is returning an unknown error error code 520 quickly?

[Neha Sharma]

Please guide me on fixing web server is returning an unknown error error code 520 quickly..

 

[Jamesandreson]

To fix error 520 (unknown error from the web server) quickly:

1. Restart your server – This clears temporary issues.
2. Check firewall or security settings – They may block Cloudflare.
3. Review server logs – Look for errors or crashes.
4. Disable plugins or themes – If using CMS like WordPress.
5. Contact your host – Server-side issues may need their help.