On the 30th of August my machine installed the following updates:
KB4023057
KB4512509
KB4506989
KB4511521
Running Win 10 Pro (64-bit) V10.0.17134, Hyper-V V10.0.17134.1
Since then I have been unable to connect to virtual machines hosted by Hyper-V more than once. In other words I can start a machine and then connect to it (either from within Hyper-V or from an RDP connection on another machine). But after disconnecting
from the session I am unable to re-connect.
RDP times out with "This computer can't connect to the remote computer. The two computers couldn't connect in the amount of time allotted."
Hyper-V times out with "Could not connect to the virtual machine. Try to connect again. If the problem persists, contact your system administrator."
The machine is still running. The heartbeat is alive. It's just impossible to connect to it.