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Fix Nginx Upstream Connection Refused & Upstream Not Found - Troubleshooting 'port is already allocated' in Docker Compose-Fix Chrome Certificate Error: Invalid Authority on Company Network

Updated 2026-07-28 09:44:34office-tools
Fix Nginx Upstream Connection Refused & Upstream Not Found - Troubleshooting 'port is already allocated' in Docker Compose-Fix Chrome Certificate Error: Invalid Authority on Company Network
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.