The Remote Procedure Call (RPC) is unavailable when trying to remotely shutdown a computer

Hello!

I operate on a Windows Server 2012 R2(Which is the server for Active Directory)  and I am trying to remotely shutdown a Windows 8.1 computer(which is in the domain).

I am using PowerShell to do this task, but after I introduce the command ( Stop-Computer -ComputerName Name) I get this error :   Stop-Computer : The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

If you could help me with this, I would appreciate.

Thanks.