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How to Fix Nginx Upstream Connection Refused on Port 80 - Fix Chrome Certificate Error: Invalid Authority on Company Network-Windows Update Error 0x80070002 Clean Boot Fix

2026-07-28 08:36:23windows-fixes
How to Fix Nginx Upstream Connection Refused on Port 80 - Fix Chrome Certificate Error: Invalid Authority on Company Network-Windows Update Error 0x80070002 Clean Boot Fix

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.

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