Problem hosting a Masterserver on an EC2

I am trying to run a Masterserver on free basic EC2 instance, running Ubuntu. I successfully compiled and run both the Masterserver and the Facilitator, but I can't actually connect to them in my unit game.

I have forwarded ports 23466 and 50005 leaving the source blank (0.0.0.0/0), and assigned my instance a static IP address.

I pointed the game to it using

 MasterServer.ipAddress = "<ADDRESS>";
 Network.natFacilitatorIP = "<ADDRESS>";
 Network.natFacilitatorPort = 50005;
 MasterServer.port = 23466;

When I try to connect a server to it in the game, I get the error messages:

 The connection request to <ADDRESS>:50005 failed. Are you sure the server can be connected to?
 Failed to connect to master server at <ADDRESS>:23466

Where should I look for a clue as to where the problem is? I can SSH into the EC2 using the static IP address, do I know that works.

Thank you