Remote desktop settings grayed out for windows server 2008

I am remotely connected to a box(as an administrator) running windows server 2008. However when I go to system properties >> remote, the options for remote desktop are grayed out. Does anyone know why this might be? I'm trying to change the remote desktop setting to only allow connections from computers running Remote Desktop with Network Level Authentication.

This is in Group Policy, in Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Security. The policy is "Require user authentication for remote connections by using Network Level Authentication."