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How to Fix Docker Pull Unauthorized Access Denied - Resolve Cloudflare 521 Error (Port 443 Blocked)-Pass Variables from Docker Compose to Dockerfile

Updated 2026-07-28 20:07:52cloud-software
How to Fix Docker Pull Unauthorized Access Denied - Resolve Cloudflare 521 Error (Port 443 Blocked)-Pass Variables from Docker Compose to Dockerfile
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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