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Fix Nginx 'upstream connection refused' When Talking to PHP-FPM - Error 0x800f081f Windows 11: Causes and Solutions-Nginx 502 Bad Gateway Docker: Causes and Solutions

Updated 2026-07-28 13:34:04developer-tools
Fix Nginx 'upstream connection refused' When Talking to PHP-FPM - Error 0x800f081f Windows 11: Causes and Solutions-Nginx 502 Bad Gateway Docker: Causes and Solutions
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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