zhizhu
Home / windows-fixes / Fix Windows Activation Error 504 Caused by Firewall Settings - SSH Host Key Verification Failed: Troubleshooting Checklist-Troubleshoot High CPU Usage by Windows Security in Windows 11

Fix Windows Activation Error 504 Caused by Firewall Settings - SSH Host Key Verification Failed: Troubleshooting Checklist-Troubleshoot High CPU Usage by Windows Security in Windows 11

2026-06-13 18:32:13windows-fixes
Fix Windows Activation Error 504 Caused by Firewall Settings - SSH Host Key Verification Failed: Troubleshooting Checklist-Troubleshoot High CPU Usage by Windows Security in Windows 11

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.