Get-CimInstance works from S1 to S2 but not from S2 to S1

I am doing a simple command Get-CimInstance -ClassName Win32_OperatingSystem – ComputerNema S2 from S1 which is a Windows 2012 R2 server running PowerShell 4.0 It fails with an error message tellingme that it failed with a Kerboros error.

When I do the same command from S2 to S1, Get-CimInstance -ClassName Win32_OperatingSystem -ComputerName S1 itworks. I am running as Administrator and have PS Remoting enabled on both servers.