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Fix Nginx 502 Bad Gateway: Upstream Connection Refused - How to Resolve Port 5432 Already Allocated in Docker-Fix npm install Permission Denied Errors on package.json

2026-07-28 15:11:44macos-help
Fix Nginx 502 Bad Gateway: Upstream Connection Refused - How to Resolve Port 5432 Already Allocated in Docker-Fix npm install Permission Denied Errors on package.json

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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