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How to Fix Nginx 'Upstream Connection Refused' Error - Fix Nginx Configuration Test Failure After Adding Proxy Pass-Fix Node Sass Build Failed Error

Updated 2026-07-28 12:23:50developer-tools
How to Fix Nginx 'Upstream Connection Refused' Error - Fix Nginx Configuration Test Failure After Adding Proxy Pass-Fix Node Sass Build Failed 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.