Problem writing object from applet to server in Firefox (Linux)

Hi,

I'm trying to write an Java applet that will send an object, via a TCP
socket, to a Java application running on the same machine. It works
in Opera and Mozilla, but it doesn't work in Firefox - the Java
application appears to receive an incoming connection, but never
actually reads the object.

Any ideas how to resolve this problem?

Code:

/////////////////////// APPLET ////////////////////////////

import java.applet.Applet;
import java.io.BufferedOutputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

public class AppletClient extends Applet {

    private Socket socket;
    private ObjectOutputStream oos;

    public void start() {
        System.out.println("Hello there!");
        try {
            String host = getCodeBase().getHost();
            socket = new Socket("127.0.0.1", 55000);
            oos = new ObjectOutputStream(new
BufferedOutputStream(socket.getOutputStream()));
            TestObject t = new TestObject("Hello!");
            oos.writeObject(t);
            oos.flush();
            oos.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

/////////////////////// APPLICATION ////////////////////////////

import java.io.BufferedInputStream;
import java.io.ObjectInputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

    private static ServerSocket serv;
    private static Socket sock;

    private Server() {
    }

    public static void main(String[] args) {

        try {
            serv = new ServerSocket(55000);

            System.out.println("Server listening on port " +
serv.getLocalPort());
            sock = serv.accept();
            System.out.println("Received connection: " +
sock.getInetAddress()
                                           + ":" + sock.getPort());
            ObjectInputStream ois = new ObjectInputStream(new
BufferedInputStream(sock.getInputStream()));
            System.out.println("Opened input stream. Attemping to
read object.");
            TestObject t = (TestObject) ois.readObject();
            ois.close();

            t.print();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

/////////////////////// OBJECT TO SEND ////////////////////////////

import java.io.Serializable;

public class TestObject implements Serializable {
    private String s;

    public TestObject(String s) {
        this.s = s;
    }

    public void print() {
        System.out.println(s);
    }
}

Thanks,

Duncan Jones