Cannot establish RMI connection to remote machine [duplicate]

Answer 1

Check your firewall settings on your aws instance RMI is running on 1099 port by default as i remember.

Answer 2

The Problem could be your RMI server is sending back its local address, instead of WAN address.

System.setProperty("java.rmi.server.hostname", *host IP*);

also take a look at security policies regarding RMI: http://docs.oracle.com/javase/tutorial/rmi/running.html