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Fix Firefox Secure Connection Failed Due to Cache - ERR_NAME_NOT_RESOLVED Troubleshooting Steps-How to Enable Windows Defender When Third-Party AV Blocks It

Updated 2026-07-28 12:29:52office-tools
Fix Firefox Secure Connection Failed Due to Cache - ERR_NAME_NOT_RESOLVED Troubleshooting Steps-How to Enable Windows Defender When Third-Party AV Blocks It
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.