Hello @Kijkziewo
RD Gateway allows TS clients to establish secure connections over SSL (443) using RPC Proxy, also known as RDP over HTTPS. To learn more about Remote Desktop Gateway see the following TechNet link:
http://technet.microsoft.com/en-us/library/dd560672(WS.10).aspx
SBS 2011 Standard Remote Web Access (RWA)
https://techcommunity.microsoft.com/t5/windows-server-essentials-and/introduction-to-sbs-2011-standard-remote-web-access-rwa/ba-p/397960
Another thread for your reference:
https://social.technet.microsoft.com/Forums/ie/en-US/90f484ac-5a46-4689-af04-7fc2551c53a5/sbs-2011-standard-secure-rdp-?forum=smallbusinessserver
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Best Regards
Karlie