I was running 4VMs on a single host - all 2008 R2 OS. I upgraded my host to 2012, and now all of my VMs freeze while trying to shutdown, or restart. I've figured out it has to be the network drivers - as if I change the VNIC to none, there are no problems restarting or shutting down. I've tried the stock drivers, new drivers, etc - nothing seems to work now. Why was this working just fine in 2008R2 and now it's not compatible in 2012??
Anyone have some advice for me besides spending more money on a network card?