Windows Server 2008 R2 is more secure by default than Windows 7, which is to be expected of a server product. Simply enabling Remote Desktop on the Remote tab of System Properties isn’t enough. You can only connect to a remote R2 machine if you can find it, which by default, you can’t.
In this screen capture taken from my Windows 7 machine, both of my Hyper-V servers are missing because they have default settings. The default settings for Windows Server 2008 R2 is to have network discovery turned off. This makes a machine mostly invisible on the network.
The easiest way to turn on network discovery on a Windows Server 2008 R2 machine is to type advanced sharing into the start menu search box and select Manage advanced sharing settings:
On Advanced sharing settings, select Turn on network discovery and click Save changes.
You may also want to select Turn on file and printer sharing, but it is not required for Remote Desktop Connection to work.