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Fix Windows Defender Access Denied Error on Startup - Fix Port Already Allocated in Windows Terminal-Troubleshooting Windows Defender 504 Error

Updated 2026-06-14 03:24:23windows-fixes
Fix Windows Defender Access Denied Error on Startup - Fix Port Already Allocated in Windows Terminal-Troubleshooting Windows Defender 504 Error
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.