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Thread: Client Server Program Not Working

  1. #1
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    Smile Client Server Program Not Working

    Below is the java code for client & server program (tcp) using socket.
    I am trying to run client & server program on 2 different machines connected 2 internet
    (1 runs server.java & other client.java).

    // Server.Java
    import java.net.;
    import java.io.;
    class Server {
    public static void main(String[] args) {
    boolean finished = false;
    try{
    ServerSocket listener = new ServerSocket(n);//n any no.
    while(!finished)
    {OutputStream out = listener.getOutputStream();
    PrintWriter pout = new PrintWriter(out, true);
    pout.println("");
    to_client.close();
    }
    listener.close();
    }// end of try
    catch(Exception ie) {
    System.out.println(ie);
    }
    }
    }

    //Client.Java
    import java.net.;
    import java.io.;
    class Client
    {
    public static void main(String[] args)
    {
    Socket client;
    String host="serverpcname";//host is assigned name of the server
    try
    {InetAddress adressen = InetAddress.getByName(host);
    client = new Socket(adressen,4444);
    BufferedReader scanf = new BufferedReader();
    String someString = scanf.readLine();
    System.out.println("From Server: "+someString);
    client.close();
    }
    catch(Exception e)
    {
    System.out.println(e);
    }
    }
    }

    When the code is executed (CLIENT.java ON 1 PC & SERVER.java on other) it gives following exceptions:java.net.UnknownHostException: serverpcname: serverpcname
    I even tried replacing host in Client.java with IP address of server
    String host="192.168.1.35";
    It gives exception:
    java.net.ConnectException: Connection timed out: connect
    Could there be any firewall problem?l

    PLZ. GUIDE ME.
    THANKS IN ADVANCE.
    Last edited by ROHIT C.; September 12th, 2010 at 11:16 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Client Server Program Not Working

    Does the code work when the server and client are on the same machine and you use the localhost(127.0.0.1) address?

  3. The Following User Says Thank You to Norm For This Useful Post:

    ROHIT C. (September 3rd, 2010)

  4. #3
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    Default Re: Client Server Program Not Working

    Thanks Norm for your reply.
    Yes it is working when client & server are executed on the same machine.
    That is it is working when following change is made to Client.java
    String host="127.0.0.1";

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Client Server Program Not Working

    That validates the code at one level. Next test should be to see if your IP addresses are correct and if there is a firewall or router or some other network problem.

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