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Windows Defender Not Opening? Here's How to Fix It - Fix Nginx Config Test Fails with 'upstream host not found'-How to Restore Windows Terminal Settings After Update

Updated 2026-06-14 13:54:08developer-tools
Windows Defender Not Opening? Here's How to Fix It - Fix Nginx Config Test Fails with 'upstream host not found'-How to Restore Windows Terminal Settings After Update
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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