Recently I couldn’t connect to Hyper-V on my local Windows 10 install. It had all been working fine and is only used to host some testing VM’s. I had recently performed a Windows upgrade, although I had also been messing quite a bit my my machine too.
The VM’s themselves were running but I just couldn’t access then via Hyper-V Manager.
Following a little Googling, running the following from an admin control prompt fixed the issue immediately.