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Fix Nginx Upstream Connection Refused Socket Error - Troubleshoot Windows 11 Update 0% – BITS Not Running-Fix 521 Error with Cloudflare Origin Pull Configuration

Updated 2026-07-28 01:45:26developer-tools
Fix Nginx Upstream Connection Refused Socket Error - Troubleshoot Windows 11 Update 0% – BITS Not Running-Fix 521 Error with Cloudflare Origin Pull Configuration
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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