Hyper-V 2008 R2 Virtual Switch Issues

Just came across an issue in Hyper-V:  I was making changes to a network adapter’s binding in Hyper-V manager under the Virtual Network Manager when MMC crashed, closing out Hyper-V manager.  Upon reopening, trying to bind the virtual switch to an External Adapter resulted in the following error:

[Window Title]
Virtual Network Manager

[Main Instruction]
Error Applying New Virtual Network Changes

[Content]
Setup switch failed.

Cannot bind to ‘HP NC373i Multifunction Gigabit Server Adapter #8’ because it is already bound to another virtual network.

[Close]

Searching the error resulted in the following KB, KB2486812:

http://support.microsoft.com/kb/2486812

Essentially, download the NVSPbind tool and extract it.  Copy the EXE to your server, run it with no switches to list all adapters.  nvspbind no switches

The format is:

{6B360F51-C6C4-4EA0-AFEF-E4D1056B498E}
“pci\ven_14e4&dev_1600&subsys_3015103c”
“Friendly NIC Name”
“Local Area Connection”:
disabled: ms_netbios       (NetBIOS Interface)
disabled: ms_server        (File and Printer Sharing for…

After finding the offending adapter, run:

nvspbind /u Friendly NIC Name

 

This will scrub the binding and allow you to try again via the GUI or Powershell.

 

 

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