Russ' Do It Yourself Home Workshop

Finding Fixes to Just About Anything and Everything

Virtual Server 2008 R2 on Windows 2008 R2 Not Detecting Physical Network Card (NIC)

Posted by Russell Wright on June 17, 2010

I’ve got a Windows 2008 R2 server that I’m running Virtual Server 2008 R2 on and, after a hard drive upgrade this past weekend, all my physical to virtual network connections were lost (broken).  Looking at my "external network" defined in Virtual Server, I found that the physical network adapter was set to "None (Guests Only)."

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Taking the advice of Ben Armstrong, Virtual PC Guy, I uninstalled the Virtual Machine Network Services on my physical server’s NIC, rebooted and then reinstalled the Virtual Machine Network Services.  I was saddened when I looked and saw that the physical NICs were still not showing up in the drop down list.

However, I had one last trick to try before another reboot.  I opened the services applet and stopped/restarted the Virtual Server and Virtual Machine Helper services.

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Then I went back to look at my list of physical NICs.  They were all there!  Networking is now back to normal.

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Update 2010-06-24:

Had this happen again so I simply stopped and restarted VS from services.msc.  The state of my running VMs was saved and the network returned without removing and re-adding the Virtual Machine Network Services.  Networking was restored.  Now, if I can only determine why this is happening.

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2 Responses to “Virtual Server 2008 R2 on Windows 2008 R2 Not Detecting Physical Network Card (NIC)”

  1. I ran into the very same problem and couldn’t find helpful information anywhere until I read your post. My virtual network and physical connections were broken, and after following your advice my problems were solved.

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    […]Virtual Server 2008 R2 on Windows 2008 R2 Not Detecting Physical Network Card (NIC) « Russ' Do It Yourself Home Workshop[…]…

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