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How to Fix Chrome Browser Proxy Error (ERR_PROXY_CONNECTION_FAILED) - Fix Windows Defender Blank Screen in Windows 11-Fix 'Port Already in Use' Error When No Process Shows

Updated 2026-06-14 00:10:49developer-tools
How to Fix Chrome Browser Proxy Error (ERR_PROXY_CONNECTION_FAILED) - Fix Windows Defender Blank Screen in Windows 11-Fix 'Port Already in Use' Error When No Process Shows
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.