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MABS v2: Error [0x8007007b] when performing a System State Backup on a DC running on a VMware VM

8:33 am in Azure, Azure Backup, Azure Backup Server, Cloud, Error [0x8007007b], MABS, MABS v2, Power, PowerShell, VMware by Wim Matthyssen

While configuring a Microsoft Azure Backup Server (MABS) v2 at a customer site, I encountered a problem while performing a System State Backup of their domain controllers (DC’s). The Protection Status showed Replica is inconsistent.


When looking in the Monitoring tab, following detailed message is show:

DPM cannot create a backup because Windows Server Backup (WSB) on the protected computer encountered an error (WSB Event ID: 517, WSB Error Code: 0x605A140).(ID 30229 Details: Internal error code: 0x8099ED0)


Because the first part of making a System State Backup is done by the local Windows Server Backup (WSB) feature, logon to the protected server and open Windows Server Backup (Server Manager – Tools – Windows Server Backup). There a message was shown indicating that the last backup has Failed.


To view the error message a bit more in detail, open the Windows Server backup log file (with the exact date and timestamp) located in C:\Windows\Logs\WindowsServerBackup.


In the log file the following error message was shown:

Error in backup of C:\windows\\systemroot\ during enumerate: Error [0x8007007b] The filename, directory name, or volume label syntax is incorrect.


When looking in the Event Viewer (Application log) I could also find the following errors (CAPI2 – 513, Backup – 517):

Event ID 513

Cryptographic Services failed while processing the OnIdentity() call in the System Writer Object.


AddLegacyDriverFiles: Unable to back up image of binary Microsoft Link-Layer Discovery Protocol.

System Error:

Access is denied.

Event ID 517

The backup operation that started at ‘‎2017‎-‎11‎-‎16T15:16:22.000076700Z’ has failed with following error code ‘0x80780049′ (None of the items included in backup were backed up.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.



Because all those errors descriptions do not really tell you what exactly is going wrong causing the backup to fail, you need to use the Diskshadow command-line tool to determine if there is an issue with the functionality of the VSS service or any of the application independent VSS writers.

To open the Diskshadow tool interface start PowerShell with elevated privileges and enter the below commands to write the output to a logfile.


When the logfile (c:\out.txt) is created open it with notepad and search for \\.



In my case, I found out there was an issue with the vsock.sys driver, which is part of the VMware vSockets Service and which is usually located in the C:\Windows\system32\drivers folder.

To fix the issue open the Registry Editor and go to the following location, HKLM\system\controlset001\services\vsock and changed the Start value to 1.




Also change the ImagePath entry from \SystemRoot\system32\DRIVERS\vsock.sys to system32\DRIVERS\vsock.sys.



When you have changed all those registry keys, logon to your MABS server and right click the failed System State backup and Perform a consistency check… (be aware that this could take a while). If the fix also solved your issue it would show OK when completed.



Hope this helps whenever you face the same error in your MABS environment. If you have any questions feel free to contact me trough my Twitter handle.

Wim Matthyssen (@wmatthyssen)

How to run the Hyper-V role on a VMware VM

10:16 am in Hyper-V, MABS v2, Nested Virtualization, PowerShell, VMware, Windows Server 2016 by Wim Matthyssen

When you install Microsoft Azure Backup Server (MABS) v2 on a Windows Server 2016, one of the prerequisites (MABS v2 prerequisites installation script) is that you install the Hyper-V role and the Hyper-V PowerShell feature.

However, while I was installing a new MABS v2 for a customer on a VMware VM (vSphere 6.5), I encountered following errors in the Hyper-V event log (41, 15350, 15340) after the Hyper-V role was installed.

Event 41 showed the following error message:

Hypervisor launch failed, Either VMX not present or not enabled in BIOS.


When I ran the Get-WindowsFeature in PowerShell it seemed Hyper-V was installed correctly. But this was not the case.


To fix the errors and get Hyper-V running like it should you need to enable Nested Virtualization for the VMware VM. To do so, shut down the VM and open the Virtual Machine Settings. Then go the Virtual Hardware tab and open the CPU options. There you need to check the box Expose hardware assisted virtualization to the guest OS. Also set CPU/MMU Virtualization to Hardware CPU and MMU.


When you now start the VM all Hyper-V related errors should be gone and all necessary Hyper-V services should be running.



Hope this blog post will help you whenever you need to setup Hyper-V on a VMware VM.

Wim Matthyssen (@wmatthyssen)

A list of tools that can be used to do a V2V from VMware to Hyper-V

11:49 am in Hyper-V, MVMC, SCVMM 2012 R2, V2V, VMware by Wim Matthyssen

From time to time clients ask me to convert VMware virtual machines (VM) to Hyper-V VMs. Briefly said to do a virtual-to-virtual (V2V) migration.


Most of the times those clients have System Center Virtual Machine Manager 2012 R2 (SCVMM) in place, which can perform those migrations with ease. You can find how you can do this by using SCVMM via following Microsoft TechNet article:

But there are also clients who don’t make use of the System Center Suite, mostly because of the price or because they have a small environment. Therefore, other tools need to be used for these V2V migrations. In this blog post I will list up some of those tools (Microsoft and third party), all with their pros and cons.

Before I start listing them up, I would like to draw your attention to some things you should keep in mind:

  • Always check the current VMware ESX version -> not all tools migrate all versions of ESX
  • Check the guest OS version -> not all tools migrate all versions of the guest OS installed
  • Be aware that almost every migration process will introduce downtime -> no “warm migration”, VMware VM down, Hyper-V VM up
  • Hyper-V GEN 1 VMs -> Only an IDE disk can be used to boot a VM, no SCSI boot from VHD
  • Hyper-V GEN 1 VMs -> Never configure a paging file on a VHD connected to a SCSI Controller
  • Hyper-V GEN 2 VMs -> Only supports the following Windows guest operating systems (OSs): Windows Server 2012 R2, Windows Server 2012, 64-bit versions of Windows 8.1 and 64-bit versions of Windows 8

Below you can find the list of the different V2V migration tools:

1) Microsoft Virtual Machine Converter (MVMC) 3.0

Download link:

Microsoft TechNet article:


  • Free
  • Automation via PowerShell
  • Can integrate with System Center Orchestrator (SCORCH) 2012 R2
  • VM and physical server (online) conversion
  • Not only Hyper-V but also Microsoft Azure is available as migration destination
  • Uninstalls VMware tools before an online conversion (VMware tools will not be uninstalled when an offline conversion is used)


  • No GEN 2 VM support

2) 5nine V2V Easy Converter 6.5 free version

Download link:


  • Free
  • GEN 2 VM support
  • Ability to override the number of vCPUs and the available vMemory
  • Remap the vNetwork
  • Ability to override the VM start/stop/delay actions
  • Automatic conversion into a Highly Available Hyper-V VM is available
  • Faster than MVMC


  • No automation trough PowerShell for the migration process in the free edition (only in the payed edition)
  • Does not remove VMware tools automatically

3) StarWind V2V Converter

Download link:


  • Free
  • Converts VMs from any format (VMDK, VHD, VHDX, …) to another


  • Requires registration in order to download it
  • Does not remove VMware tools automatically

Before ending this post, I also want to mention the Disk2vhd tool which enables you to do a physical-to-virtual (P2V) migration. You can dowload it via following link:

You can also read all about how to use this tool in a blog post I wrote some time ago:

Like you can see you have several tools you can use, all with their advantages and possible disadvantages. Newer versions of those tools mostly include new features and add support for more OSs. I mostly prefer to use MVMC if SCVMM is not available to do the migration, but off course the choice is all yours. Hopefully this list helps, till next time!

Wim Matthyssen (@wmatthyssen)