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How to Fix Nginx Upstream Connection Refused Error - Fix 'port already allocated' Error in Docker Compose-Resolve pip's Externally-Managed-Environment Error

Updated 2026-07-28 16:42:19cloud-software
How to Fix Nginx Upstream Connection Refused Error - Fix 'port already allocated' Error in Docker Compose-Resolve pip's Externally-Managed-Environment Error
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.