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Node.js Garbage Collection Tuning to Avoid Heap Out of Memory - Troubleshooting Cloudflare 521 Error: Port 443 Blocked-Resolve Nginx 502 Bad Gateway for Docker Containers

Updated 2026-07-28 17:30:16security-tools
Node.js Garbage Collection Tuning to Avoid Heap Out of Memory - Troubleshooting Cloudflare 521 Error: Port 443 Blocked-Resolve Nginx 502 Bad Gateway for Docker Containers
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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