Connection problem with sockets in java

Question

i tried this code: http://programming-guides.com/java/tcp-client-server-chat (full example)

and it's working but when i switch the "host" int the client side to an external IP (insted of localhost) it give me this error: "Cannot get IO for connection to.."

i treid to switch the port but it didnt work..

Answer 1

Is the server running on that remote machine? Is the port open in the firewall?

Answer 2

Try to netcat to the remote host. If you get an connection the example maybe wrong. If not, you cannot connect to that host: host not exists, not listen on that port, port is filtered, etc, etc.