RMI thorugh FIREWALL

Question

Hello Everybody,
I really appreciate if anybody help me with some solutions regardind Java RMI.
I have a client-server application, and I use Java web start to depoy my application on the client side.
The application is split in two folders client and server.All the classes located on the client side I copied into a folder located under mycomputer/inetpub/myfolder.Here I create the jar and jnlp files in order to by accesed by users from internet(outside the firewall).
On the server side I have this code:
SEVER SIDE
import java.rmi.*;
import java.rmi.RMISecurityManager;
import java.rmi.server.*;
public class RegisterIt{
     public static void main(String args[]){          
try{
     System.setProperty(java.security.policy","java.policy");
System.setSecurityManager(new RMISecurityManager());
               HelloImpl oHello = new HelloImpl();
               System.out.println("Remote object instantiated!");
               Naming.rebind("rmi://coop7:65500/HelloEntry",oHello);
               System.out.println("Remote object bound in registry!");
     } catch (Exception e){
               System.out.println("Problem binding: ");
               e.printStackTrace(System.out);
On the client side I have this code:
CLIENT SIDE
public class Name {
     public static void main(String args[]){
System.setProperty("java.security.policy","java.policy");
System.setSecurityManager(new RMISecurityManager());
     //some code here
class MyListener implements ActionListener {
     public void actionPerformed(ActionEvent be){
     try{
Hello obj = (Hello)Naming.lookup("rmi://coop7:65500/HelloEntry");
Me a = obj.getMe(Name.tfUser.getText(),Name.tfPass.getText());
Name.tfName.setText(a.name+" "+a.lname);
     } catch(RemoteException re){
          System.out.println("Remote Exception: ");
               re.printStackTrace(System.out);
     } catch(Exception e){
          e.printStackTrace(System.out);
I have the file java.policy in both side, client and server:
JAVA.POLICY
grant {
     permission java.security.AllPermission;
I have open port # 65500 on the firewall.I checked and it seems to be ok.
If I run the application localy (intranet=client-server) everything is fine.
IF I try to run from Internet(outside my local network) the application starts but I do not communicate att all with the application sever.(I don't get anything back from the application server.
I have some questions:
- on the server side i have this setup
Naming.rebind("rmi://coop7:65500/HelloEntry",oHello);
Since my computer has an URL =http://test.com, I have tried to replace coop7(which is valid on my local network )with test.com but I got binding error when
i try to bind the name in the registry (using rmic, start rmiregistry 65500, java RegisterIt):
Connection refused to host: test.com.
Once again if I replace test.com with coop7 everything works.
- on the client side I have this setting:
Hello obj = (Hello)Naming.lookup("rmi://coop7:65500/HelloEntry");
If I run the class everything is fine.
If I try to change from "coop7" to "test.com" I got a java exeception: "Unknown source name"
The computer name for intranet: coop7
The computer name for internet: test.com (URL http://test.com)
Can anyone help me with the porcedure how to setup step by step this configuration?
I am wondering what I have to put on the client side, on the server side,
what Command I have to type for the hostname and codebase when I start the registry
Actually I have:
java -Djava.rmi.codebase=http://test.com/test.jar
-Djava.security.policy=java.policy RegisterIt
and I do not use at all -Djava.rmi.hostname.
I really appreciate, once again any idea, I can provide more info if you want.
Thanks,
George

Answer 1

Thank you very much.
Do you know for HTTP tunnelling how many ports do I have to use in order to have RMI working: 2 or 3?
- one for RMI registry (1099)
- one from the server to the client(5800)
- one from the clinet to the server?(5900)
or
- one for RMI registry and for communications from the client to the server(default 1099)
- one for communications from the server to the client(5800)