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How to Fix Cloudflare 521 Error During Setup - How to Fix DNS_PROBE_FINISHED_NXDOMAIN in Chrome-How to Repair Blue Screen After Removing Windows 11 Update

Updated 2026-07-28 12:28:51office-tools
How to Fix Cloudflare 521 Error During Setup - How to Fix DNS_PROBE_FINISHED_NXDOMAIN in Chrome-How to Repair Blue Screen After Removing Windows 11 Update
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.