Need help badly- Keep getting error: connection refused.

Question

I'm developing an online multiplayer game, and everytime I try to use the multiplayer capabilities I get this kind of error. I have created a mini-connection class just to test if my program is working right, and apparently not. I have not included disconnection object in the following classes, since they are unneccessary since I cannot connect in the first place. First I ran my Servertest.class, which runs up to "Waiting for Connection", then waits, then I ran my ClientTest.class, which always gives me the error at teh bottom of the page.
Please tell me what is wrong with the following-
import javax.swing.*;
import java.awt.*;
import java.util.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.net.URL;
import java.io.*;
import java.net.*;
public class Servertest {
private ObjectInputStream input;
private ObjectOutputStream output;
private ServerSocket server;
private Socket connection;
public void Servertest() {
public void runServer() {
try {
server = new ServerSocket( 12347, 100 );
System.out.print( "Waiting for connection\n" );
connection = server.accept();
System.out.print( "Connected to: " + connection.getInetAddress().getHostName() );
output = new ObjectOutputStream( connection.getOutputStream() );
output.flush();
input = new ObjectInputStream( connection.getInputStream() );
System.out.print( "\nGot I/O Streams\n" );
catch ( IOException ioException ) {
ioException.printStackTrace();
public static void main( String args[] ) {
Servertest application = new Servertest();
application.runServer();
import javax.swing.*;
import java.awt.*;
import java.util.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.net.URL;
import java.io.*;
import java.net.*;
public class ClientTest {
private ObjectInputStream input;
private ObjectOutputStream output;
private Socket client;
public void ClientTest() {
public void runClient() {
System.out.println( "Attempting Connection" );
try {
client = new Socket( InetAddress.getLocalHost(), 12348 );
System.out.println( "Connected to: " + client.getInetAddress().getHostName() );
output = new ObjectOutputStream( client.getOutputStream() );
output.flush();
catch (EOFException eofException) {
System.err.print( "Client Terminated Connection!" );
catch (IOException ioException) {
ioException.printStackTrace();
public static void main( String args[] ) {
ClientTest application = new ClientTest();
application.runClient();
When I run Server Test it shows: Waiting for Connection.
When I run Client Test is show the following:-
Attempting Connection
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:153)
at ClientTest.runClient(ClientTest.java:26)
at ClientTest.main(ClientTest.java:41)
Any help would be greatly appreciated!

Answer 1

Your server listens on port 12347. Your client tries to connect to a different port. No server is listening on the other port, so the connection is refused. Solution: make client connect to port 12347.