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Fixing NGINX Upstream Connection Refused SSL Errors - Troubleshooting Cloudflare 521 Error After DNS Change-Troubleshooting npm ENOENT package.json Error

Updated 2026-07-28 17:11:10cloud-software
Fixing NGINX Upstream Connection Refused SSL Errors - Troubleshooting Cloudflare 521 Error After DNS Change-Troubleshooting npm ENOENT package.json 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.