Cannot establish a socket

Hi I have written an applet which I have displayed on my homepage, its a registration form that I had hoped to use to allow people to create acounts for a program (im very slowly) working on.
When the register button on the applet is clicked, a socket is created on a server ive also written which runs on my pc and the specified username and password are sent to a server and recorded.
Problem is I cant get the applet to estabilish a socket when I try viewing my homepage from outside of my network.
Just to clear a few things up!
Im running my own web server Apache 2.0.
Its not a software or hardware firewall issue I have all nessary ports forwarded to my router correctly. I have successfully connected to the server from a client that isnt an applet in a webpage from outside my network.
Is this a Java security issue where by an applet cant estabilish a socket on a server ?

Ok heres a simplified version of my code!
Incase theres any confussion to test this you will need to save all 4 of the following files into the same directory.
ServerThread, Server and Applet as .java files and then compile them.
Applet.html as a html file.
Run the Server and then open index.html in a web browser.
Applet Code Applet.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Scanner;
import java.io.PrintWriter;
import java.io.*;
public class Applet extends JApplet
    static JTextField inputFieldUsername;
    static JLabel labelUsername;
    static JButton buttonRegister;
    static JLabel labelServerError1;
    static Socket skt;
    static Scanner in;
    static PrintWriter out;
    static InputStream instream;
    static OutputStream outstream;
    public void init()
         try
             skt = new Socket("localhost", 4444);
             instream = skt.getInputStream();
             outstream = skt.getOutputStream();
             in = new Scanner(instream);
             out = new PrintWriter(outstream);
             setLayout(null);
             setSize(200, 300);
              labelUsername = new JLabel("Username:");
              getContentPane().add(labelUsername);
              labelUsername.setBounds(30, 50, 100, 20);
              inputFieldUsername = new JTextField();
              getContentPane().add(inputFieldUsername);
              inputFieldUsername.setBounds(140, 50, 200, 20);
              buttonRegister = new JButton("Register");
              getContentPane().add(buttonRegister);
              buttonRegister.setBounds(155, 200, 90, 20);
         catch(Exception ex)
             setLayout(null);
             setSize(200, 300);
             labelServerError1 = new JLabel("<html><body><p>Server is temporarily down, please refresh your web browser.</p></body></html>");
             getContentPane().add(labelServerError1);
             labelServerError1.setBounds(140, 30, 200, 50);
} Server Code Server.java
import java.net.*;
import java.io.*;
public class Server
    public static void main(String[] args) throws IOException
        ServerSocket serverSocket = null;
        boolean listening = true;
        try
            serverSocket = new ServerSocket(4444);
            System.out.println("Server enitilized, awating clients.");
        catch (IOException e)
            System.err.println("Could not listen on port: 4444.");
            System.exit(-1);
        while (listening)
            new ServerThread(serverSocket.accept()).start();
              System.out.println("Client connected");
        serverSocket.close();
}Code to create individual threads for each client that connects ServerThread.java
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class ServerThread extends Thread
    static InputStream instream;
    static OutputStream outstream;
    static Scanner in;
    static PrintWriter out;
    private Socket socket = null;
    public ServerThread(Socket socket)
         super("MultiServerThread");
         this.socket = socket;
    public void run()
         try
              instream = socket.getInputStream();
            in = new Scanner(instream);
            outstream = socket.getOutputStream();
            out = new PrintWriter(outstream);
             while(in.hasNext())
        catch (IOException e)
}Html Code index.html
<html>
<body>
     <h1 align="center">Register a username</h1>
          <hr>
                     <p>Enter a username and press register to register it</p>
             <hr>
        <applet CODE="Applet.class" WIDTH="500" HEIGHT="250"></applet>
        <hr>
</body>
</html>You should fine that the client is able to establish a socket on the server, but it you edit the line in Applet.java
skt = new Socket("localhost", 4444); to skt = new Socket("Your external Ip address", 4444);
And if your using a router you port forward 4444 on your router to the ip address of the computer on ur network running the server the client will no longer be able to establish a socket on the server.
Why is this?
If i havent explained my problem clearly enough please tell me and ill try rephase it!

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