Socker Error using simple app

Question

Hello All
I have a simple app that consists of a client and server. This works fine when both components are on the same network (either on the same machine or two different machines), however I get the following error when the client and server are on different networks:
java.net.SocketException Unrecognized Windows Sockets Error :10071
Some strange things:
1) If I reverse the client & server, the app works (ie if the client is on network 1 and the server on network 2, the app fails but if the client is on network 2 and server on network 1, it's ok)
2) The above error appears to be an NFS error - both machines are Windows
3) My network administrator says there are no problems with the firewall and this should work ok.
Thanks for any help
Chris

Answer 1

The problem actually raised itself in an rmi app, so I thought I'd just write the following test code to eliminate the rmi layer. As you can see, it's all simple stuff:
Server Code:
import java.io.*;
import java.net.*;
public class TestServer
  public static void main(String[] args)
    int port = 1099;
    if (args.length > 0)
      try
        port = Integer.parseInt(args[0]);
      catch (NumberFormatException e)
        e.printStackTrace();
        System.exit(0);
    try
      ServerSocket s = new ServerSocket(port);
      while (true)
        new MessageDumper(s.accept()).run();
    catch (Exception e)
      e.printStackTrace();
  static class MessageDumper implements Runnable
    public MessageDumper(Socket s)
      this.s = s;
    public void run()
      try
        BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
        String str = br.readLine();
        System.out.println(s.getInetAddress().getHostName() + " says " + str);
        PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s.getOutputStream())));
        pw.println("GoodBye");
        pw.flush();
        pw.close();
        br.close();
        s.close();
      catch (Exception e)
        e.printStackTrace();
    Socket s;
Client Code:
import java.io.*;
import java.net.*;
public class TestClient
  public static void main(String[] args)
    int port = 1099;
    String host = "localhost";
    // arg 0 is host, arg 1 is port
    switch (args.length)
    case 2:
      try
        port = Integer.parseInt(args[1]);
      catch (NumberFormatException e)
        e.printStackTrace();
    case 1:
      host = args[0];
    try
      Socket s = new Socket(host, port);
      PrintWriter pw = new PrintWriter(new OutputStreamWriter(new BufferedOutputStream(s.getOutputStream())));
      pw.println("Hello");
      pw.flush();
      BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
      String str = br.readLine();
      System.out.println(str);
      br.close();
      pw.close();
      s.close();
    catch (Exception e)
      e.printStackTrace();
}