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Docker Desktop Engine Stopped: Fix Firewall Block - How to Enable Origin Pull to Fix Cloudflare 521-Troubleshooting Nginx proxy_pass Connection Refused

Updated 2026-07-29 01:47:36macos-help
Docker Desktop Engine Stopped: Fix Firewall Block - How to Enable Origin Pull to Fix Cloudflare 521-Troubleshooting Nginx proxy_pass Connection Refused
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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