Client - Server Networking

Question

I did not know the right place for this topic , but it may be as much of a networking problem or an applet problem.
The requirement is that the client interacts with the server through an applet (client side) , the problem being that an unsigned applet is not allowed to create connections , is there any way in which we may overcome this problem ? (Use of applets is a must)
The source is as follows
class Ping implements Runnable{
    private Thread PingThread;
    private String PingServerAddr;
    private DatagramSocket socket;
    private int Socket_no;
    Ping(String PingServerAddress){
        //Create a new ping thread
        PingThread = new Thread(this,"Ping Thread");
        PingServerAddr = PingServerAddress;
        Socket_no = 25519;
        try{
            socket = new DatagramSocket(Socket_no);
        }catch(SocketException socketexception){
            socketexception.printStackTrace();
            System.exit(1);
        PingThread.start();
    private void doPing(){
        byte PingData[] = "Alive".getBytes();
        DatagramPacket sendPacket;
        try {
            sendPacket = new DatagramPacket(PingData, PingData.length, InetAddress.getByName(PingServerAddr), Socket_no);
            socket.send(sendPacket);
        } catch (UnknownHostException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
    public void run(){
        while(true){
            doPing();
            try {
                Thread.sleep(10000);
            } catch (InterruptedException ex) {
                ex.printStackTrace();
//A Ping object has been created in the init() function of the appletThe error is as follows,
Exception in thread "Ping Thread" java.security.AccessControlException: access denied (java.net.SocketPermission ***.***.***.***:**** connect,resolve)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkConnect(Unknown Source)
     at java.net.DatagramSocket.send(Unknown Source)
     at Ping.doPing(Player.java:81)
     at Ping.run(Player.java:92)
     at java.lang.Thread.run(Unknown Source)
Any help would be appreciated.
Regards,
Flummoxed

Answer 1

No, signing requires the author of the applet to do
some work.
The only alternative is to only try to connect to the
host where the applet was loaded from.Yes ultimately that is what I had to revert to , we used the getCodeBase().getHost() in order to speak to the server applet.