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Discussion of Hyper-V
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    Hi, I am trying to create a differencing VHDX disk based on a snapshot AVHDX disk.

    The PowerShell command I am using is as follows:

    New-VHD -Path abc.vhdx -ParentPath d:\vm\fs00\fs00_6ccd6d16-98d2-498f-94eb-1335ab0b1558.avhdx -Differencing

    which unfortunately fails saying the AVHDX extension on the parent disk is not allowed:

    The file extension for 'd:\vm\fs00\fs00_6ccd6d16-98d2-498f-94eb-1335ab0b1558.avhdx' is invalid.
    Virtual hard disk for this operation must have a .vhd or .vhdx 
    extension.+ CategoryInfo          : InvalidArgument: (:) [New-VHD], VirtualizationException+ FullyQualifiedErrorId : InvalidParameter,Microsoft.Vhd.PowerShell.Cmdlets.NewVhd

    Preliminary research indicates that differencing disk can be based on other differencing disk, and also that AVHDX files are indeed differencing disks. Indeed, repeating the command after renaming the extension of the parent disk file from .AVHDX to .VHDX works!

    Is this a bug in the New-VHD cmdlet? Or is using an AVHDX file as the parent of a differencing disk not supported for some reason?

    Also would you have any suggestion for how I can workaround the bug? Renaming the AVHDX would be problematic.

    Thanks for any help.

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  • 07/13/18--05:57: Hyper-v core & openvpn
  • Hello

    I am in a bit of a struggle i have Hyper-v core 2012 running and when I connect to my network via OpenVpn server manager works but cant use Hyper-v console to get gui of my VMs error: RPC server unavailable. I never had that error before.

    Any ideas ?

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  • 07/13/18--16:18: Outgoing traffic blocked
  • Hi,

    I moved a Hyper-v guest to another server (host), but now outgoing traffic is blocked in the hyper-v:

    • Incoming traffic is ok
    • Outgoing traffic is blocked (using telnet <host> <port>) returns timeout, I can't even open any webpage
    • I can ping to any host
    • I can trace route to any host
    • I disabled windows firewall
    • No antivirus installed

    Does anybody have an idea of what could be the problem?

    Thanks in advance.


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    I have hyper-V host with windows server 2016, and VMs with Windows Server 2016.
    Without explanation today the virtual machines have shut down and in the event logs has the following explanation:
    The process C: \ Windows \ System32 \ svchost.exe (SVRIISWEBRI) started Shutdown the system from the SVRIISWEBRI computer by the NT \ SYSTEM AUTHORITY user for this reason: Other (planned)
      Reason code: 0x80000000  Shutdown Type: Shut Down  Comment:
    I wonder what this can be and how to solve it?

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    I have several VMs running in Hyper-V on Server 2016 that we shutdown remotely and then reboot the host. They're all configured to automatically restart upon the host's reboot, with a startup delay varying between 30 and 600 seconds (each VM is different). 

    SOME of the VMs will happily restart.  SOME of the VMs do not start at all.

    Looking in the Hyper-V event logs, there are absolutely no errors or complaints logged at all. It's as if it never even tries to restart those VMs. 

    We're not doing anything weird storage-wise; all VMs are using the same HDD storage area. We're well within the available RAM of the host machine (128GB). There's nothing odd about their boot options. Several of these VMs are identically configured to each other, and one will start while the other won't. 

    What in the world is going on?

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    Hello everyone,

    Trying to deploy WDS on a virtual lab with Hyper-V (Running on a Windows 10 1803 17314 host).

    I finish my configuration on a VM server which runs WDS and DHCP at the same time (also a domain controller, DNS), which we will call192.168.0.1 (Windows Server 2012 R2 Standard Build 9600).

    I set the scope options of 60, 66 and 67 as usually mentioned when you are running both services in the same computer:

    Problem is, I don't have this so called "wdsmgfw.efi" file in my boot base of the WDS files, the only .efi file I have there its called bootmgfw.efi, which doesn't do anything if declared on that option. I tried almost all boot files, including .com BIOS files on that folder and files on x86 folder, but obviously didn't worked as well, since Gen 2 machines works with UEFI. 

    What happens when I boot a VM Gen2 machine alternating between those files:

    wdsmgfw.efi: It says that the file weighs 0 bytes (as this file doesn't exist) and returns error PXE-E23: TFTP error from server. restarting the boot process.

    bootmgfw.efi: It returns a error screen saying that failed to start, a recent hardware or software change might be the cause with the code: 0xc000000f: The Boot configuration Data for your PC is missing or contains errors. (any .com files): It says that the file has X bytes, downloading the NBP file, successfully downloaded NBP file and restart the boot proccess.

    If I don't declare any file on Option 67, he tries the default wdsmgfw.efifor the error above.

    Right now, if I choose the file and try to boot on a Gen 1 machine, it works normally, I can access the boot files of WDS Server. But since I'm deploying Windows 10 images in this scenario, I need a solution that will apply to Gen 2 machines.

    Last year (on build 1709 of Windows 10 maybe) I was able to successfuly do this lab with no issues, and deployed a Windows 10 Client Customized Image to my clients on network, which was Gen 2 machines as well, but I don't remember now what am I doing wrong, or if something is different on Hyper-V running on this build 1803 of my host.

    Any suggestions?

    Edit¹: Tried with the Secure boot disabled and enabled which doesn't do any difference on scenarios above.

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    Looking for advise and if anyone has used the below sort of setup. We currently have a S2D cluster which we are transitioning to a new cluster using external storage. Unfortunately, the first node removed from the S2D cluster easily but now no more nodes will remove from the cluster. This is causing me issues because I dont have enough compute resources in the new cluster to move everything across as part of the migration. 

    Currently I have 2 x Clusters, CLU1 has 2 nodes with external storage. CLU2 has 6 nodes utilizing S2D for storage. 

    What I want to know is, can I assign a disk from my external storage to the 6 node cluster and do storage migrations to the external storage while S2D is still enabled? I would then once all VHD's are sitting on the external storage, disable S2D in the CLU2 cluster. This should then allow me to simply remove the nodes from the cluster as they will be compute only resources. After that would move the node to the new CLU1 and migrate all machines across. 

    If anyone has done something similar or has experience would be great to hear what you have done. 


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    I was wondering what is the purpose of the Hyper-V Administrators group within the domain, since a user has to be in the local group to have access to a Hyper-V server management?

    I tried to add a user to the domain group hoping the Hyper-V server would accept the user, without having to log on locally and add it to the local group, but after waiting and running gpupdate, the user was not accepted to connect via Hyper-V Manager tool.

    Thanks, Dominic

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    I have a few questions related to Server 2012 R2 Licensing. 

    1. As I know if we are running Hyper-V on Windows Servers 2012 R2 we can run 2 VM's with the same server license. With my understanding

      One Server 2012 R2 License

    •   1 Physical License
    •   2 VM's on Hyper -V

    Is this correct or wrong?

    2. If we are planning to implement UAT Servers and Test Server in the production environment how is the licensing process. Do we have to purchase the license for Test servers and UAT? All Servers planning to run on Hyper-V

    Looking for experts comments 

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    Hi Guys,

    hopefully someone can help me.

    I've got a server running Server 2016 HyperV Core edition.

    I have another full edition Server 2016 with HyperV.

    Both machines are on a workgroup.

    Both machines have firewall disabled.

    Both machines have eachothers names within trustedhost.

    Both machines can resolve DNS and ping.

    I have installed the certificates on both servers.

    I am able to browse to C$ from full edition to  core edition.

    I have enabled PSRemoting on both servers.

    When I try and access the remote server (Core) from the HyperV manager of the full edition it just disappears and nothing happens.

    When I try and enable replication betwen full to core I get as far as entering the replica server details but then the "verifying configuration" screen is just going off/on constantly and I get no further.

    If I pair my core edition and a Windows 10 machine I can successfully add in the core server to the HyperV manager of the Win10 PC.

    Any ideas?

    Thank you.

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  • 07/16/18--09:27: iSCSI LUNs dropping from VM?
  • Hi

    We have a 2-node cluster. The nodes are running 2016 DC but most of our VMs are 2008 R2. We have a weird issue with one of those VMs (which File Services on to be a file server). This server has DFS-R to an identical server in another site.

    If I RDP into this server and just watch 'Computer' in Windows Explorer, the C: drive will appear to lose connection, and so will the E: drive. The C: drive is a LUN on our NetApp FAS2020 SAN and the E:, F: and G: drives are LUNs on our QNAP iSCSI SAN.

    All iSCSI traffic has dedicated LAN adapters AND switches. This seems to be the only VM affected by this 'outage'.

    As you can see, the C: and E: drives lose both the bar and text capacities below the drive, and we get the progress bar in the address bar as if Windows is trying to resolve them (which it eventually does). Plus, when this happens some of our applications on client machines sieze up (we have folder redirection to this file server).

    Where can I even begin to look to diagnose this one?!


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    I’ve upgraded my infrastructure hastily and I done this before the correct way but as I sold my original server I had move the VM’s quickly but with consequences.

    The correct way would have been to build the server, add to domain whilst it was live on a different Hyper-V host, assign static IP, change server name, installed windows feature e.g. Hyper-V, etc.

    I done this before and all worked fine as the DC is a VM which is was always online to authenticate against without issues e.g. AD, DNS, DHCP. however as mentioned I rushed it and now I’m stuck in a workgroup environment on the Hyper-V server 2016 core install.

    current Setup:

    x1 HP ProLiant ML350 G6, 3 partitions with partition 1 is OS running Hyper-V server 2016 (Core OS), Partition 2 is VMS Datastore (I store all my Virtual machines here) and Partition 3 is ISO and general software and files.

    all other Hyper-V servers are offline and unavailable which would not help as DC VM is offline

    Currently the Hyper-V server 2016 core is in a workgroup environment

    IP address for the server are statically assigned, and I can ping them from w10 workstation

    All workstations are on the domain there are no workgroups and I cannot connect to the domain asthe VM is offline

    Firewall has been disabled on server and workstations to allow connectivity for ping, etc

    routers been configured for DHCP, DG to allow connectively 


    How do I import the DC VM into Hyper-V via PowerShell, so I can turn it on, then I can connect the server to the domain after configuring the server IP statically, so the IP & DNS point to the DC VM and all will be good in the world again as I can use Hyper-V manager to connect and import the other VM via Hyper-V manager?


    I have a Hyper-V server 2016 core install and I’m not sure how to import the virtual machine to get them started using PowerShell with VM’s located on a different partition, does anyone know how to do this?

    Thank you, God speed

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    Greetings and salutations

    I'm encountering an error with host to host migration both host are hyper-v server 2016 core installs and using windows 10 and server 2016 to manage them (dual boot) on client.

    Background Info: I had a server 2012 which I converted from full gui to core and this had the VMs hosted on the DAS then I moved the VM's to the new 2016 core installed hyper-v server hosts.

    New system: I have upgraded to 2 x server running hyper-v server 2016 and removed the server 2012 after migration the VM's successfully from 2012 hyperV to each of the new hyper-v 2016 server meaning 2012 was able to migrate to 2016 with no issues but when I try to migrate from 2016 to 2016 I get errors.

    Error: I get an Kerberos errors so I amended the delegation of each computer (hyper-v 2016 servers) in AD to allow Kerberos only for cifs and vm migrations, used PowerShell and undertook a gpupdate /force on the DC and both hyper-v 2016 servers. now it seems like this credential update is not reach the 2016 hyper-v hosts as this error keeps appearing no matter how many times I amend the DC (removed re-added, gpupdate /force etc).

    client VMs on 2016 hyper-v host Version: All VMs have been updated and operate a version 8.0 which is server 2016 since the migration from 2012 to 2016

    management client: W10 laptop domain joined with RSAT installed, hyper-v manager installed and working, able to PowerShell to each server e.g. Enter-PSSession -ComputerName: etc, RDP connects no issues, project Honolulu works fine. all good.

    aspect of management work fine but just cant use vm migration on 2016 hyper-v core host?

    Hyper-V Hosts: Both fully updated - set to auto, download all (test environment not live), logged in with domain accounts domain\username

    RDP Enabled secure only

    Domain joined

    NIC: static assigned 

    Can anyone shed some light on this error?

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    I would like to share my (free!) solution for installing software on a Hyper-V guest, when that installer checks for usb support.

    My problem was that I tried to install a HP printer and scan driver in a Windows XP guest, running on Windows 8 Hyper-V. The installation failed with a message that no USB hardware and drivers were found and setup could not continue...
    Duhhhh, I am trying to install it as a network printer/scanner, you HP morons!

    After searching the web, I found various solutions. One of them was installing the Guest OS under VMWare Workstation, install the HP printer software (since VMWare workstation has USB support) and then migrate the VMWare guest to Hyper-V. I thought this was way too much work!

    Then I stumbled on the KernelPro usb-over-ethernet solution. I downloaded the free client and installed it on the Windows XP guest under Hyper-V. I did not connect to any usb-over-ethernet server, as I do not have one. However, having the usb-over-ethernet client running, made the HP installer believe the Hyper-V guest had full USB support and happily installed the software.

    Here you can find the free download for the KernelPro usb-over-ethernet client:

    Kind regards,

    Erik Cheizoo

    excellence & Difference - the art of identity management

    eXcellence & Difference - We keep your business running

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  • 07/17/18--00:34: Hyper V with NIC Teaming
  • Hi

    I have to create Hyper Failover cluster and i will host 22 VMs with multiple Vlans ( vlan 33 , vlan 34 , vlan 42 Vlan 22)

    my question:

    After i create teaming and Virtual switches and Vnics

    what is the TCP /IP configuration for Vnic ( Management , Live Migration , Clusters , etc)  is it required to put Gateway or ip & subnet only ??

    What is the configuration for NIC teaming card ? shall i put ip adreess for Tnic?

    I will create Vswitch for each different Vlan , what is the configuration in the VM itself to stick its vlan on its traffic?



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    we had a problem with our backup-software. There have been created checkpoints every day but haven't deleted after the backup.
    I merged the avhdx files until only a vhdx-disk has been left with the following powershell command:

    merge-vhd -Path FS1_F6BECDB6-FE79-4A43-A550-7F5FD563A062.avhdx -DestinationPath FS1_FFA1D4D5-033F-4E3C-ACB4-222CBFBCE14D.avhdx

    This works all find. Then I chanced the disks at the fail-over-manager from the avhdx-files to the vhdx.files. The server now runs without any problems.

    BUT!! in the Hyper-V-manager the old checkpoint are still visble and I'm not able to delete them with the following message:
    The operation failed because the file was not found.
    That message is write - all the avhdx-files have been deleted.

    How do I manage to delete these old - no longer existing - checkpoints? As long as they exist the backup-software will not create new ones and we don't have a backup :(

    I hope someone can help me to solve this problem.

    Thank you in advance


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    Just curious if anyone has seen this on Windows 10 1709. We haven't tested against Windows 10 1703 but this looks rather painful and I am wondering if this is normal behavior for a VM. We currently have the virtual TPM enabled and nested virtualization enabled for Isolated User Mode on the Windows 10 1709 guest VMs.

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    Hi guys

                Any workaround to restore VM files .vmdk to HyperV


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    I like to config a VM will be revert to specific snapshot every reboot. Seen like Hyper-v not support that, so do we have any tool or script support that?


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    I am new to virtualization in general.  I am trying to figure out what I can do to install management software that uses SQL Server 2017.  As you know, SQL Server does not like to be installed on a domain controller which is the Windows Server 2012 R2 Essentials operating system. Rather than buy another server just to run SQL Server 2017 and buy another operating system, I was wondering if its possible to install the Hyper-V role and use the Hyper-V to create a virtual machine just for SQL Server 2017, the management software and the remote access into the management software thru an IIS website that has an SSL Certificate.  Would I be able to leave the existing operating system the way it is if I am able to use Hyper-V? I am interpreting some web sites as saying I could have 2 copies of my operating system then. One being virtual.. then other websites I interpret it as it becomes 2 virtual machines.. one basic, one with all roles and features.  I am not sure what to do, if its possible or if I should be looking another direction. Again, I am totally green to this whole area so need some direction.  I don't want to affect what the server is doing right now.. I don't want to cause it issues by installing SQL Server 2017 on it.. possibly...

    if this is possible at all in hyper-v... could someone point me in the right direction to learn more as a newbie and figure out how to configure it and access it etc...