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Fix Chrome Hardware Acceleration Black Screen in Windows 11 - How to Fix Nginx Upstream Connection Refused-Cloudflare 521 Error During Setup – How to Resolve

Updated 2026-07-28 07:17:03office-tools
Fix Chrome Hardware Acceleration Black Screen in Windows 11 - How to Fix Nginx Upstream Connection Refused-Cloudflare 521 Error During Setup – How to Resolve
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.

More repair notes

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