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Docker Compose Environment Variable Not Set in Dockerfile - How to Fix a Windows 11 Blue Screen Loop with a USB Drive-Troubleshoot Cloudflare 521 and Proxy Issues

Updated 2026-07-28 21:37:32cloud-software
Docker Compose Environment Variable Not Set in Dockerfile - How to Fix a Windows 11 Blue Screen Loop with a USB Drive-Troubleshoot Cloudflare 521 and Proxy Issues
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.