Are you trying to use Virtual Machine Manager (VMM) and getting the VMM 609 error?
You aren’t alone. I figured out this morning it is related to the integration components and that they are not at the same level as the server. Months ago I create a new VM. After creating it I sys-prepped my machine and used the sys-prepped drive as part of my templates in the VMM library. Since creating the template my server got updated and so did the integration components. Because of this, when I went to go use the template I got heart beat errors because the VM and Host are not at the same level.
Lesson learned? Well, make sure that you always have the same integration components installed. Want to learn from my Hyper-V mishaps? Check out the Virtual Machine Manager & Hyper-V section of my blog.