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Hyper-V Server R2 – Virtual Switch: Error applying new virtual network changes

Hi, this might be a bit of topic but since I’m working on a lot of other things this month to get updated on the basics again I’m posting it for future reference.

I ran into an issue with applying an external virtual switch to a interface on Hyper-V Server 2008 R2.  The error was "Error applying new virtual network changes…binding to external Ethernet… failed".  "Cannot bind to … because it is already bound to another virtual network". 

To fix it open the command prompt on Hyper-V Server 2008 R2 and run:

netcfg -u vms_pp

netcfg –l c:\windows\winsxs\amd64_wvms_pp.inf_31bf3856ad364e35_6.1.7600.16385_none_beda85050b13680c\wvms_pp.inf -c p -i vms_pp

Have a great summer….