Client connection to a Server behind a router

Question

Hello everyone,
I'm building a client / server application where the server will be my machine that is in residential gateway behind a router. the client will be out of the U.S. completely. On the client side the connection method (connectTo(InetAddress ip)) must know the server IP address in order to connect to it. I've tried configuring port-forwarding on my router to have it forward any connection under port 5555 to my local IP and passing my public IP on the client side to that connection method. Disappointingly, that didn't work. Here is my Code for the server:
import java.io.*;
import java.net.*;
* Server class, to accept concurrent client
* requests,through accepting socket connection
* and establishing a new thread to provide the
* desired service
* @author True
* @see source.ServiceProvider
public class Server {
     * Creates a new instance of source.Server
    public Server(){
        try{
            ServerSocket ss = new ServerSocket(5555);
            while(true){
                Socket sock = ss.accept();
                ServiceProvider sp = new ServiceProvider(sock);
                 sp.start();
        catch(IOException x ){
            // handles exception here
     * Main method creates a new instance of Server
     * @param args String [] of parameters at the excusion time
    public static void main(String args[]){
        new Server();
}And here is my code for the client:
// irrelevant code here...
private void connectTo(InetAddress ip){
         try{
             Socket sock = new Socket(ip, 5555 );
//           Building Streams
             OutputStream os = sock.getOutputStream();
             ObjectOutputStream oos = new ObjectOutputStream(os);
             InputStream is = sock.getInputStream();
             ObjectInputStream ois = new ObjectInputStream(is);
             // more irrelevant code here...
         catch(IOException x){
             // handle exception here
         catch(ClassNotFoundException x){
             // handle exception here
}Any ideas or comments are welcome and highly appreciated.

Answer 1

true_lover wrote:
All configuration seem fine. port forwarding is straight forward on the router page. I checked all numbers & values and all seemed fine.Well obviously it's not. Otherwise you wouldn't be getting a connection refused.
The only other item worth checking is if your ISP is blocking the port. Which may well be happening.
The other poster was correct, once you have the exception figured out (aka what it is) and it's connection refused this is not actually a Java related problem any more and you should take that question to a general networking forum.
Edited by: cotton.m on 27-Nov-2008 7:46 PM