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Fix Cloudflare Error 521 After a Server Update - How to Fix Docker NGINX 502 Bad Gateway-Stop Docker Build Canceled Errors with .dockerignore

2026-07-28 16:05:13cloud-software
Fix Cloudflare Error 521 After a Server Update - How to Fix Docker NGINX 502 Bad Gateway-Stop Docker Build Canceled Errors with .dockerignore

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.

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