this is an off topic post which I'm posting mainly as a memory prompt for myself. I was working with a set of virtual machines the other day on my test server and received the following error when I tried logging in:
I logged onto the Hyper-V server and launched the VM from Hyper-V Manager and was able to log in without issue. I did some fiddling around and realised that my Domain Controller wasn't accepting connection requests.
One quick reboot later and I was able to log into the VM without error.