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Cloudflare 522 Error: Server Response Time Troubleshooting - How to Fix Nginx Upstream Connection Refused on Port 80-Resolving npm run build Errors on macOS

Updated 2026-07-28 11:16:50cloud-software
Cloudflare 522 Error: Server Response Time Troubleshooting - How to Fix Nginx Upstream Connection Refused on Port 80-Resolving npm run build Errors on macOS
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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