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WireGuard Handshake Not Completing: Firewall Fixes - Windows Defender Update Fails with Code 0x80070643-Troubleshoot High RAM Usage by Microsoft Defender

Updated 2026-06-13 15:16:01cloud-software
WireGuard Handshake Not Completing: Firewall Fixes - Windows Defender Update Fails with Code 0x80070643-Troubleshoot High RAM Usage by Microsoft Defender
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.