RMI - Criando HelloWorld

Erro na classe HelloClient -> Connection refused to host: cgt76219; nested exception is: 
	java.net.ConnectException: Connection refused: connect

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface Hello extends Remote {
	String sayHello() throws RemoteException;
}

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class HelloImpl extends UnicastRemoteObject implements Hello {

	private static final long serialVersionUID = 1L;

	protected HelloImpl() throws RemoteException {
		super();
	}

	@Override
	public String sayHello() throws RemoteException {
		return "Hello World";
	}

}

import java.rmi.Naming;
public class HellClient {
	public static void main(String args[]) {
		// Cria e instala o security manager
		// System.setSecurityManager (new RMISecurityManager () );
		try {
			Hello obj = (Hello) Naming.lookup("rmi://cgt76219/HelloServer");
			System.out.println(obj.sayHello());
		} catch (Exception e) {
			System.out.println("Erro na classe HelloClient -> " + e.getMessage());
		}
		System.exit(0);
	}
}

import java.rmi.Naming;
public class HelloServer {
	public static void main(String args[]) {
		// Cria e instala o Security Manager
		// System.setSecurityManager(new RMISecurityManager());
		try {
			HelloImpl obj = new HelloImpl();
			Naming.rebind("HelloServer", obj);
			System.out.println("Hello Server pronto.");
		} catch (Exception e) {
			System.err.println("Erro na classe HelloServer " + e.getMessage());
		}
	}
}