Client/Server Communication Problem

[nithin chinni]

Hi, I am new to java and completely new to this networking. I tried to run this program in order to have a communication between client/server. when I tried it in the same network its working.Then, I have kept both programs in different networks and tried to communicate. This is where its throwing an error

java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.networking.DailyAdviceClient.go(DailyAdviceClient.java:15)
at com.networking.DailyAdviceClient.main(DailyAdviceClient.java:35)

I really doubt if its achievable or do I need to add something for this?Oh and by the way I have "Port Forwarded" the routers in both locations.
CLIENT PROGRAM:

package com.networking;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class DailyAdviceClient 
{
	public void go()
	{
		
			try {
				Socket s = new Socket("65.0.XX.XXX",4242);
				InputStreamReader sr = new InputStreamReader(s.getInputStream());
				BufferedReader br = new BufferedReader(sr);
				
				String advice = br.readLine();
				System.out.println("Today you should:"+advice);
				br.close();
			} catch (UnknownHostException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		
	}
	
	public static void main(String args[]) 
	{
		DailyAdviceClient dac = new DailyAdviceClient();
		dac.go();

	}

}

SERVERPROGRAM:

package com.test;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class ServerTest 
{
	String[] adviceList={"Advice 1","Advice 2","Advice 3","Advice 4"};
	
	public void go()
	{
		try {
			ServerSocket ss = new ServerSocket(4242);
			while(true)
			{
				Socket sock = ss.accept();
				PrintWriter writer = new PrintWriter(sock.getOutputStream());
				String advice = getAdvice();
				writer.println(advice);
				writer.close();
				System.out.println(advice);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private String getAdvice()
	{
		int random = (int)(Math.random()*adviceList.length);
		return adviceList[random];
	}
	
	public static void main(String[] args)
	{
		ServerTest server = new ServerTest();
		server.go();
	}

}

[Rob Spoor]

The Java code certainly doesn't have any problems. We both got it working on one single machine (after I replaced the client's host). That means that the problem is on a network level.

Can you ping the server from the client machine?
Can you connect to the port using telnet? (Execute "telnet 65.0.XX.XXX 4242" from a command line; on Windows Vista / 7 you may have to use "Turn Windows features on or off".)


And could you please UseCodeTags in the future? Thanks!

[nithin chinni]

Rob Spoor wrote:The Java code certainly doesn't have any problems. We both got it working on one single machine (after I replaced the client's host). That means that the problem is on a network level.

Can you ping the server from the client machine?
Can you connect to the port using telnet? (Execute "telnet 65.0.XX.XXX 4242" from a command line; on Windows Vista / 7 you may have to use "Turn Windows features on or off".)


And could you please UseCodeTags in the future? Thanks!

Sorry about not using the code tags. I am new to forums. Well regarding the issue i will look into that. Thanks for your help.