Can't connect Hyper-V Server 2012 R2 after Windows 10 update?

You will need to enable the use of WinRM to connect to your Hyper-V server. To do this you will need to:

Open the Start menu Click on All Programs and then on Accessories Right click on Command Prompt and select Run as administrator Type in winrm quickconfig and hit enter. You will then need to say ‘y’ (yes) to a couple of prompts

Type in: winrm set winrm/config/client '@{TrustedHosts="RemoteComputerName"}' and hit enter. Substitute "RemoteComputerName" with the name or IP address of your Hyper-V server.

After the Windows 10 upgrade you have to re-authorize the Hyper-V server again. That's it.. resolved.

the command line entry was missing the single quotes around @{TrustedHosts="RemoteComputerName"}. it needs to be '@{TrustedHosts="RemoteComputerName"}'