How to do successful remote lookup from EJB deployed in EAP 6.x from EAP 4/5

Issue

• We would like to lookup a remote EJB that is running on JBoss EAP 4.x. The client is a war that runs in JBoss EAP
  6.x.

• The following below is the client code snippet that is being used,

jndiProperties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
jndiProperties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
jndiProperties.put("jboss.naming.client.ejb.context", "true");
jndiProperties.put(Context.PROVIDER_URL, "remote://...:4447 or jnp://...:1099");

• We get the following below errors in the logs:

"JBAS011843: Failed instantiate InitialContextFactory org.jboss.naming.remote.client.InitialContextFactory "

• What values for Context.INITIAL_CONTEXT_FACTORY, Context.URL_PKG_PREFIXES and Context.PROVIDER_URL do we have to use?

• What configuration need to be added to the JBoss or the application ?