King Computer Solutions
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08.12.2013

HyperV machine missing network card after restoring VHD on Windows 2012 server

Problem

  • You have restored a VHD or moved it to a new HyperV 2012 Server from a 2008 server.
  • When you restore and recreate the HyperV machine and start it up, it has no network connectivity.
  • Running ipconfig shows media disconnected with no network card.

  • Device manager shows no network device and Other devices showing as unknown device

Solution

  • run a command prompt and configure the system to start in safe mode
  • bcdedit /set {default} safeboot
  • Shut down and restart the virtual server
  • Open device manager


  • uninstall the Microsoft virtual machine bust network adapter and the unknown devices


  • insert integration services setup disk from the HyperV menu


  • run the setup to install the latest integration components


  • press OK to upgrade and restart the server


  • It may show configuring windows updates for a while


  • I found the system went through 2-3 reboots until it finally came back to a login screen in safemode.
  • Login and check the device manager
  • you should see the Microsoft virtual machine the network adapter



  • open a command prompt and run ipconfig to confirm an adapter is now present. It may have a self assigned 169 address unless you have a DHCP server running outside the VM.
  • and remove the SafeBoot option

    bcdedit /deletevalue {default} safeboot

    • reboot again to start in normal mode
    • I found going to reset the network address settings for static address would have remembered the previous address and prompts you.


  • Set the address, reboot and confirm it comes up OK