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Fixing Cloudflare 521 Error with Nginx Configuration - Stop Windows Security Login Loop-Fix Windows Search 502 Bad Gateway After Update

2026-06-13 15:51:15macos-help
Fixing Cloudflare 521 Error with Nginx Configuration - Stop Windows Security Login Loop-Fix Windows Search 502 Bad Gateway After Update

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.