Hi @Hank Woo 

Is your Windows machine in domain ? If yes, please ensure you are using Domain Credentials to connect. Moreover, the credentials should have access to WMI.

Also, please ensure that WMI Port 135 is listening on your Windows Machine. You can check for WMI connectivity from your Mid Server as well to your Windows machine or make use of Test Credentials Utility to check for WMI issues.

Thanks & Regards

Amit Verma