After fidling around for a while trying to make FSRM work to connect to a 2012 R2 Core server as it kept complaining that the RPC server was unavailable even though other MMC snap-ins were working correctly; I finally found out it was the firewall blocking the ports.
Use this command if you cant make it work:
netsh advfirewall firewall set rule group=”Remote File Server Resource Manager Management” new enable=yes