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Fix DNS Probe Finished NXDOMAIN on Google DNS Setup - All Websites Show Secure Connection Failed in Firefox: Solutions-How to Fix Chrome Profile Sync Error

Updated 2026-07-28 19:08:38macos-help
Fix DNS Probe Finished NXDOMAIN on Google DNS Setup - All Websites Show Secure Connection Failed in Firefox: Solutions-How to Fix Chrome Profile Sync Error
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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