EJB Lookup Issue with WebSphere Application Server 6.1

At first I want to tell that similar type of questions has been asked here but still I can't find the solution of my problem.

I have a EJB Project (name = HelloWorldEJBProject). There I have created a stateless remote EJB (name = HelloWorldEJB). I have also created an remote interface there (name= HelloWorldEJBInterfaceRemote). After that I am creating a jar & an ear of the project after compiling everything using ant. Then I deployed the EAR in the WebSphere Application Server 6.1.

Next I have also created a stand alone java project (name = HelloWorldClient), put the jar of the HelloWorldEJBProject to this project build path. Now while I am doing the look up I am getting errors.

HelloWorldEJB.java:

package com.staples.ejb;

import com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote;
import javax.ejb.Stateless;

@Stateless
public class HelloWorldEJB implements HelloWorldEJBInterfaceRemote {


    public HelloWorldEJB() {
    }

    public String helloWorld() {

        return "Hello World";
    }

}

Client.java (Inside HelloWorldClient project):

package com.staples.client.processor;

import com.staples.client.util.ApplicationUtil;
import com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote;

public class Client {

    static private HelloWorldEJBInterfaceRemote helloInterface = ApplicationUtil.getHelloEJBHandle();

    public static void main(String[] args) {
        System.out.println(helloInterface.helloWorld());

    }

}

ApplicationUtil.java (Inside HelloWorldClient project):

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;

import com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote;

public class ApplicationUtil {

    public static Object getContext(){
        Object obj = null;
        Context context;
        try {
            Hashtable env = new Hashtable();
            env.put(Context.INITIAL_CONTEXT_FACTORY,"com.ibm.websphere.naming.WsnInitialContextFactory");
            //Also tried the following
            //env.put(Context.PROVIDER_URL,"iiop://localhost:2809");
            env.put(Context.PROVIDER_URL,"corbaloc:iiop:localhost:2809");

            Context ctx = new InitialContext(env);
            obj = ctx.lookup("ejb/HelloEAR/http://ift.tt/1GyhATM" + HelloWorldEJBInterfaceRemote.class.getName());

        } catch (NamingException e) {
            e.printStackTrace();
        }
        return obj;
    }

    public static HelloWorldEJBInterfaceRemote  getHelloEJBHandle()
    {

        Object obj = getContext();
        HelloWorldEJBInterfaceRemote  helloInterface = (HelloWorldEJBInterfaceRemote) PortableRemoteObject.narrow(obj, HelloWorldEJBInterfaceRemote.class);
        return helloInterface;      

    }

Error:

    Jun 10, 2015 6:25:55 PM com.ibm.ws.naming.util.WsnInitCtxFactory
WARNING: jndiUnavailCommErr
javax.naming.ServiceUnavailableException: A communication failure occurred while attempting to obtain an initial context with the provider URL: "corbaloc:iiop:localhost:2809".  Make sure that any bootstrap address information in the URL is correct and that the target name server is running.  A bootstrap address with no port specification defaults to port 2809.  Possible causes other than an incorrect bootstrap address or unavailable name server include the network environment and workstation network configuration. [Root exception is org.omg.CORBA.TRANSIENT: java.net.ConnectException: Connection refused: connect:host=vdipn5243.staplesams.com,port=2809  vmcid: IBM  minor code: E02  completed: No]
    at com.ibm.ws.naming.util.WsnInitCtxFactory.mapInitialReferenceFailure(WsnInitCtxFactory.java:2226)
    at com.ibm.ws.naming.util.WsnInitCtxFactory.mergeWsnNSProperties(WsnInitCtxFactory.java:1386)
    at com.ibm.ws.naming.util.WsnInitCtxFactory.getRootContextFromServer(WsnInitCtxFactory.java:924)
    at com.ibm.ws.naming.util.WsnInitCtxFactory.getRootJndiContext(WsnInitCtxFactory.java:848)
    at com.ibm.ws.naming.util.WsnInitCtxFactory.getInitialContextInternal(WsnInitCtxFactory.java:533)
    at com.ibm.ws.naming.util.WsnInitCtx.getContext(WsnInitCtx.java:117)
    at com.ibm.ws.naming.util.WsnInitCtx.getContextIfNull(WsnInitCtx.java:712)
    at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:171)
    at javax.naming.InitialContext.lookup(InitialContext.java:363)
    at com.staples.client.util.ApplicationUtil.getContext(ApplicationUtil.java:27)
    at com.staples.client.util.ApplicationUtil.getHelloEJBHandle(ApplicationUtil.java:38)
    at com.staples.client.processor.Client.<clinit>(Client.java:8)
    at java.lang.J9VMInternals.initializeImpl(Native Method)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:196)
Caused by: org.omg.CORBA.TRANSIENT: java.net.ConnectException: Connection refused: connect:host=vdipn5243.staplesams.com,port=2809  vmcid: IBM  minor code: E02  completed: No
    at com.ibm.CORBA.transport.TransportConnectionBase.connect(TransportConnectionBase.java:425)
    at com.ibm.ws.orbimpl.transport.WSTransport.getConnection(WSTransport.java:429)
    at com.ibm.CORBA.transport.TransportBase.getConnection(TransportBase.java:187)
    at com.ibm.rmi.iiop.TransportManager.get(TransportManager.java:93)
    at com.ibm.rmi.iiop.GIOPImpl.getConnection(GIOPImpl.java:129)
    at com.ibm.rmi.iiop.GIOPImpl.locate(GIOPImpl.java:205)
    at com.ibm.rmi.corba.Corbaloc.locateUsingINS(Corbaloc.java:307)
    at com.ibm.rmi.corba.Corbaloc.resolve(Corbaloc.java:378)
    at com.ibm.rmi.corba.ORB.objectURLToObject(ORB.java:3770)
    at com.ibm.CORBA.iiop.ORB.objectURLToObject(ORB.java:3256)
    at com.ibm.rmi.corba.ORB.string_to_object(ORB.java:3667)
    at com.ibm.ws.naming.util.WsnInitCtxFactory.stringToObject(WsnInitCtxFactory.java:1511)
    at com.ibm.ws.naming.util.WsnInitCtxFactory.mergeWsnNSProperties(WsnInitCtxFactory.java:1362)
    ... 12 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:391)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:252)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:239)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:389)
    at java.net.Socket.connect(Socket.java:551)
    at java.net.Socket.connect(Socket.java:501)
    at java.net.Socket.<init>(Socket.java:409)
    at java.net.Socket.<init>(Socket.java:223)
    at com.ibm.ws.orbimpl.transport.WSTCPTransportConnection.createSocket(WSTCPTransportConnection.java:270)
    at com.ibm.CORBA.transport.TransportConnectionBase.connect(TransportConnectionBase.java:354)
    ... 24 more
Exception in thread "P=953453:O=0:CT" java.lang.NullPointerException
    at com.staples.client.processor.Client.main(Client.java:13)

I am not sure also what to write as a argument of context.lookup(). I am pretty new in EJB. Can anybody help me please? Thanks in advance.