Remote desktop services on secondary server not accessible from internet

I am having an issue configuring remoteapps. I have two servers, Server 2011 SBS, fully configure and running great. The second server, Server 2008R2, is a backup server hosting a company db. We would like to configure remoteapps on the R2 server.

I have added the role and configuration and is running and accessable from the R2 server.

Can it be accessible from outside the network, over the internet?

Any guidance would very much be appriciated!

Thank you