Veeam ONE raises the following event-based alarm: Bad Hyper-V username logon attempt.
The Bad Host Username alert suggests that someone is attempting to access the host with an invalid username or password.
Veeam ONE raises the Bad Hyper-V username logon attempt alarm based on the Hyper-V event that is received from the MS Hyper-V host:
The further issue troubleshooting should be performed on the MS Hyper-V server side.
If you would like to find out the root cause of the event, investigate the Security log on your Hyper-V host > Computer Management > Event Viewer > Windows Logs. Find the event record mentioned above and see the details.