Windows Server 2012 R2 update thoughts hyper-v virtual Ethernet adapter network cable unplugged
If you update a windows server 2012 to the R2 version and you have teamed the Network card you could end in trouble. Especially if you run hyper-v.
You could find this in your device manager. No way to uninstall the network adapter and even with show hidden devices. you will see the Vnics but are unable to uninstall them.
Cleaning the register is also no option you don’t have the rights to do this only the trusted installer has rights. yes you could change this but is this the best decision ? I don’t thinks so
So here you are with several vnic’s and stuck in your system, uninstalling hyper-v is the best option but you will need to import all the virtual machines. yes you can us PowerShell and scripts to do this but if you have this situation the wmi objects are also stuck and most scripts won’t work.
Create a new switch and new networks next to the old stuff and leaf the old nics disabled is an option but not the best method. ( IMHO ) Fix it and see if the networks are gone and working well to avoid feature problems is the best approach.There is one line to fix this :
netcfg –u vms_pp
Remember after running this all the Virtual Machines on this machine are lost their network card. you will need to add the new network card to the VM and assign it to the new switch. this can be done by PowerShell quick and easy. After this you have one healthy Hyper-v Server or Cluster.