I have a Windows Hyper-V 2012 R2 server and a Windows 8.1 PC running Hyper-V Manager. Neither the server or the PC are connected on a domain so have used the instructions here https://code.msdn.microsoft.com/windowsdesktop/Hyper-V-Remote-Management-26d127c6
to connect them. I can now see the server from the PC but when it's loading the VMs (there are none built yet), it gives the error "RPC Server unavailable. Unable to establish communication between 192.168.2.20 and WINDOWS8"
WINDOWS8 is the name of the PC running the Hyper-V Manager.