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Home / office-tools / Fixing Nginx Upstream Connection Refused in Load Balancing - Fix ERR_CERT_AUTHORITY_INVALID on Localhost-Troubleshooting Cloudflare Error 522: Step-by-Step

Fixing Nginx Upstream Connection Refused in Load Balancing - Fix ERR_CERT_AUTHORITY_INVALID on Localhost-Troubleshooting Cloudflare Error 522: Step-by-Step

Updated 2026-07-28 06:59:02office-tools
Fixing Nginx Upstream Connection Refused in Load Balancing - Fix ERR_CERT_AUTHORITY_INVALID on Localhost-Troubleshooting Cloudflare Error 522: Step-by-Step
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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