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How to Fix Windows Update Error 0x80070643 - OpenVPN Connection Failed Exit Code 1: Practical Fixes-Fixing WireGuard Handshake Failures Behind NAT

Updated 2026-06-13 11:35:19cloud-software
How to Fix Windows Update Error 0x80070643 - OpenVPN Connection Failed Exit Code 1: Practical Fixes-Fixing WireGuard Handshake Failures Behind NAT
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.