As all of us know, that the Windows Server Essentials 2012R2 (and also 2012 and 2011) has a RD Gateway installed and is working by default. This is a great functionality and my personal opinion is that users use it a lot. However, the only thing that is missing is the management console to configure it. I miss it a lot.
It is not difficult to install it and you can do it with the command dism /online /Enable-Feature:Gateway-UI (run it from the administrative command prompt).
After this, you will be able to configure all settings that are available in standard Windows Server product.
The complete Microsoft article about all this functionality is available here..