Confirm guarded hosts can attest

Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016

A fabric administrator needs to confirm that Hyper-V hosts can run as guarded hosts. Complete the following steps on at least one guarded host:

  1. If you have not already installed the Hyper-V role and Host Guardian Hyper-V Support feature, install them with the following command:

    Install-WindowsFeature Hyper-V, HostGuardian -IncludeManagementTools -Restart
  2. Make sure the Hyper-V host can resolve the HGS DNS name and has network connectivity to reach port 80 (or 443 if you set up HTTPS) on the HGS server.

  3. Configure the host's Key Protection and Attestation URLs:

    • Through Windows PowerShell: You can configure the Key Protection and Attestation URLs by executing the following command in an elevated Windows PowerShell console. For <FQDN>, use the Fully Qualified Domain Name (FQDN) of your HGS cluster (for example, hgs.bastion.local, or ask the HGS administrator to run the Get-HgsServer cmdlet on the HGS server to retrieve the URLs).

      Set-HgsClientConfiguration -AttestationServerUrl 'http://<FQDN>/Attestation' -KeyProtectionServerUrl 'http://<FQDN>/KeyProtection'

      To configure a fallback HGS server, repeat this command and specify the fallback URLs for the Key Protection and Attestation services. For more information, see Fallback configuration.

    • Through VMM: If you are using System Center Virtual Machine Manager (VMM), you can configure Attestation and Key Protection URLs in VMM. For details, see Configure global HGS settings in Provision guarded hosts in VMM.


    • If the HGS administrator enabled HTTPS on the HGS server, begin the URLs with https://.
    • If the HGS administrator enabled HTTPS on the HGS server and used a self-signed certificate, you will need to import the certificate into the Trusted Root Certificate Authorities store on every host. To do this, run the following command on each host: PowerShell Import-Certificate -FilePath "C:\temp\HttpsCertificate.cer" -CertStoreLocation Cert:\LocalMachine\Root
    • If you've configured HGS Client to use HTTPS and have disabled TLS 1.0 systemwide, see our modern TLS guidance
  4. To initiate an attestation attempt on the host and view the attestation status, run the following command:


    The output of the command indicates whether the host passed attestation and is now guarded. If IsHostGuarded does not return True, you can run the HGS diagnostics tool, Get-HgsTrace, to investigate. To run diagnostics, enter the following command in an elevated Windows PowerShell prompt on the host:

    Get-HgsTrace -RunDiagnostics -Detailed


    If you're using Windows Server 2019 or Windows 10, version 1809 or later, and are using code integrity policies, Get-HgsTrace return a failure for the Code Integrity Policy Active diagnostic. You can safely ignore this result when it is the only failing diagnostic.

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Additional References