Hyper-V Beta, and RC0 worked great. I recently upgraded to RC1, and in the process of both trying to move a VHD from another server and trying to create a new VM from scratch I repeated received the following error:
Failed to add device ‘Microsoft Synthetic Ethernet Port’
Here’s what I figured out: The Microsoft Forefront Client Security that was running on the host machine was interfering. Once I excluded both .XML and .VHD files in Forefront, everything started working again. That was an easy fix.
