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Fix Nginx Upstream Connection Refused Error - Docker Port Conflict: How to Fix and Prevent-Docker Compose Environment Variable Not Set in Dockerfile

Updated 2026-07-28 04:34:27browser-issues
Fix Nginx Upstream Connection Refused Error - Docker Port Conflict: How to Fix and Prevent-Docker Compose Environment Variable Not Set in Dockerfile
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.

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