Error 521 Error 521 occurs when the origin web server refuses connections from Cloudflare

Security solutions at your origin may block legitimate connections from certain Cloudflare IP addresses ↗

The two most common causes of 521 errors are: – Offlined origin web server application

– Blocked Cloudflare requests

Contact your hosting provider or site administrator and share the necessary error details to assist in troubleshooting these common causes: – Ensure your origin web server is responsive

– Review origin web server error logs to identify web server application crashes or outages

– Confirm Cloudflare IP addresses ↗ are not blocked or rate limited

– Allow all Cloudflare IP ranges ↗ in your origin web server's firewall or other security software

– Confirm that — if you have your SSL/TLS mode set to Full or Full (Strict) — your origin supports HTTPS and/or you have installed a Cloudflare Origin Certificate or a certificate matching the requirements for these modes

– Find additional troubleshooting information on the Cloudflare Community ↗

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🔗 Sumber: https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-521