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Fix Nginx Upstream Connection Refused Error - Troubleshooting Nginx Upstream Connection Refused 443-Docker Engine Stopped Due to Firewall – How to Fix

Updated 2026-07-28 10:54:14macos-help

Fix Nginx Upstream Connection Refused Error - Troubleshooting Nginx Upstream Connection Refused 443-Docker Engine Stopped Due to Firewall – How to Fix

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.