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Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome Safe Mode - Resolving Cloudflare 521 Errors with Server Log Analysis-Chrome Sync Not Working on School Chromebook: Fixes

Updated 2026-07-28 07:16:01developer-tools
Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome Safe Mode - Resolving Cloudflare 521 Errors with Server Log Analysis-Chrome Sync Not Working on School Chromebook: Fixes
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.