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Fix Nginx Upstream Connection Refused & Upstream Not Found - Fix Nginx 502 Bad Gateway: Upstream Connection Refused-DNS Probe Finished NXDOMAIN: Troubleshooting Checklist

Updated 2026-07-28 05:20:50security-tools
Fix Nginx Upstream Connection Refused & Upstream Not Found - Fix Nginx 502 Bad Gateway: Upstream Connection Refused-DNS Probe Finished NXDOMAIN: Troubleshooting Checklist
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Decision checklist

  • Match the tool to the workflow that fails most often, not only the feature list.
  • Keep export format, permissions, and automation limits in the final decision.

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