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Fix Nginx Upstream Connection Refused Timeout Error - Resolve Chrome NET::ERR_CERT_AUTHORITY_INVALID from Antivirus-Troubleshooting Nginx Syntax Error on Config Test

2026-07-28 13:30:36office-tools
Fix Nginx Upstream Connection Refused Timeout Error - Resolve Chrome NET::ERR_CERT_AUTHORITY_INVALID from Antivirus-Troubleshooting Nginx Syntax Error on Config Test

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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