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Solve Error 521 status code: avoid Cloudflare can not connect to the source site method - Photon Flux | Professional WordPress repair service, worldwide, fast response

Resolving Error 521 Status Codes: Ways to Avoid Cloudflare's Failure to Connect to the Source Site

Cloudflare returns Error 521 mostly due to the source station can not respond to the request, this article introduces the troubleshooting methods, including server status, SSL configuration, firewall settings and IP whitelist optimization and other steps.