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Fix Windows Store Error 0x80073cf9: Configuration Issue - How to Fix Cloudflare Error 521 (Web Server Down)-Resolve Defender Update Connection Timeout

Updated 2026-06-13 18:58:57developer-tools
Fix Windows Store Error 0x80073cf9: Configuration Issue - How to Fix Cloudflare Error 521 (Web Server Down)-Resolve Defender Update Connection Timeout
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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