zhizhu
Home / developer-tools / Fix Windows Defender Update Failed Errors - How to Fix Remote Desktop Protocol Version Mismatch-PuTTY Connection Refused: Causes and Fixes

Fix Windows Defender Update Failed Errors - How to Fix Remote Desktop Protocol Version Mismatch-PuTTY Connection Refused: Causes and Fixes

Updated 2026-06-14 03:36:49developer-tools
Fix Windows Defender Update Failed Errors - How to Fix Remote Desktop Protocol Version Mismatch-PuTTY Connection Refused: Causes and Fixes
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.