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Fix Cloudflare 520, 521, 522, 523 and 524 Origin Errors

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Web & Domains intermediate 6 min read $0.01 Updated 2026-10-19

Meaning and fixes of Cloudflare 520-524 errors: origin firewall allowing Cloudflare IPs, web server down or overloaded, wrong port or SSL mode, DNS pointing at the wrong IP, long-running requests and the 100 second timeout.

Cloudflare shows its own error page instead of your site. Each 52x code means a different failure between Cloudflare and your origin: refused, timed out, empty response or unreachable.

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#cloudflare#cdn#origin#timeouts#troubleshooting

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