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Question

I am facing a login authentication failure when your Commvault Access Node tries to connect to your VM inside Hyper-V host.

  • October 17, 2025
  • 1 reply
  • 71 views

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Details of the Error

 

  • Error Message: "Failed to connect to virtual machine host  as user Failed to connect to virtual machine host as user  from access node . Please ensure that the access node is able to communicate with the host and that the user account and password are correct.

  • Both the Physical server of Hyper -v and backup server are in the domain and the VM inside the hyper -v is in workgroup. 

1 reply

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  • Vaulter
  • October 19, 2025

Hi SHUBHJ2004,

The error states that the user privileges have failed to connect to the Hyper-V host. 

There’s 3 likely reasons for this.

1) The username or password is incorrect. This is less likely if it’s the same credentials used when setting up Hyper-V but a password change could cause this if it wasn’t updated in Commvault.

2) The account assigned to Hyper-V doesn’t have privileges to connect to Hyper-V

3) Hyper-V uses WMI to communicate to hosts, if there is an issue with WMI such as the services not running or a privilege issue, this can cause the issue too.

You can try some things such as logging onto a host as your Hyper-V user and running a WMI command such as (replace <GUID> with a VM GUID):
 

Get-WmiObject -Namespace "root\virtualization\v2" -Query "select * from Msvm_ComputerSystem Where Name = '<GUID>'"


Hopefully this helps