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How to Fix Cloudflare Error 521: Server Not Responding - DNS Probe Finished NXDOMAIN vs Server Not Found Error Fix-Troubleshooting Nginx Redirect Loops

2026-07-28 22:18:14
How to Fix Cloudflare Error 521: Server Not Responding - DNS Probe Finished NXDOMAIN vs Server Not Found Error Fix-Troubleshooting Nginx Redirect Loops

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

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