Want to connect to computer over internet. Getting exception- Connection refused:connect

[Harish Moolchandani]

I want to create a simple chat program which can work through internet not only in local network. I started from basics and created two simple client and server program which on connecting shares one message. The java program works fine when testing on local network but when testing it through internet it gives exception "Connection refused: connect".

I'm testing on one PC (although I've tried it on two computers, but it didn't worked).
Server programs starts at port 5000. Client programs connects with Server by providing dynamic internet IP of server. Client also knows the port number.

Server Program:

import java.net.*;
import java.io.*;
class Server
{
public static void main(String []args)
{
try
{
ServerSocket serv = new ServerSocket(5000);
System.out.println("Server up and listening:");
Socket S = serv.accept();
System.out.println("Server accepted the connection request");
InetAddress obj = S.getInetAddress();
System.out.println("Request Coming from "+obj);
BufferedReader br = new BufferedReader(new InputStreamReader(S.getInputStream()));
String msg = br.readLine();
System.out.println("Message recieved:"+msg);
br.close();
serv.close();
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}

Client Program:

import java.net.*;
import java.io.*;
import java.util.*;
class Client
{
public static void main(String []args)
{
Socket S = null;
BufferedOutputStream bout = null;
InetAddress obj = null;
try
{
obj = InetAddress.getByName(args[0]); //args[0] will be the dynamic IP address of Server.
S = new Socket(obj, 5000);
System.out.println("Client Connected!");
System.out.println("Enter Message:");
String str = new Scanner(System.in).nextLine();
byte[] arr = str.getBytes();
bout = new BufferedOutputStream(S.getOutputStream());
bout.write(arr);
bout.write(13);
bout.write(10);
bout.flush();
bout.close();
S.close();
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}

What I've tried yet:
Tried disabling firewall and avast antivirus.
Done port forwarding into my router.
Tested telnet, it calls my modem home page, when called with dynamic IP.
Also, I tested it removing router and connecting directly to modem. But still getting exception.
Program is working in local network.

Please Help, I'm new to networking.

[john price]

Let's do a check...
Change:

S = InetAddress.getByName(args[0]); //args[0] will be the dynamic IP address of Server.
S = new Socket(obj, 5000);

To:

S = new Socket("localhost", 5000);

See if there is any errors then. Remember to have the server running BEFORE you run the client...
John Price aka cc11rocks

[Harish Moolchandani]

I have already mentioned that it is working in local network. So localhost or computer name or 192.168.X.X is working.
Also I haven't tested it outside my network i.e I tried running this program using 2 computers, but they are in the same network, hence their dynamic IP will be same. Although I port forwarded it, but no result. Should I try running client program outside my network?

[john price]

It should easily run inside your network. Will take a look at it later today when I get home...
John Price aka cc11rocks

[Harish Moolchandani]

I tried "netstat -a" to see where it is running and listening in my local network. And it was listening to 0.0.0.0:5000, I though it might be a problem and binded it with my local network address which is 192.168.0.102. And now it is listening to 192.168.0.102:5000.
But now the problem is, this is the local address. In Foreign Address, the "netstat -a" shows "HARISH:0", the name of the computer is OK but the port number is 0. What does this means?

[Harish Moolchandani]

The problem is solved.
Problem was not in my program, but in port forwarding, my modem is also a router and it was blocking incoming connection making them unable to reach to my router.
I took help from http://forum.pcwintech.com website's forum. Awesome website admins are wiling to help anytime. Anyone has networking related problem can refer to this site.
Here is my forum post link, if anyone has this issue.
Problem in Port Forwarding