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How to Enable DNS over HTTPS in Chrome - Troubleshooting Outlook Server Connection-Cloudflare 521 Error After Update: Fixes That Work

Updated 2026-06-14 10:34:48office-tools
How to Enable DNS over HTTPS in Chrome - Troubleshooting Outlook Server Connection-Cloudflare 521 Error After Update: Fixes That Work
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.