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Fix 'Port Already Allocated' Error in Windows Defender on Windows 10 - Fix Windows Update Version Mismatch Error-Reset Windows Security Cache Step by Step

Updated 2026-06-13 14:33:14browser-issues
Fix 'Port Already Allocated' Error in Windows Defender on Windows 10 - Fix Windows Update Version Mismatch Error-Reset Windows Security Cache Step by Step
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.