How can i secure the link between tomcat and ejb in jboss

[xianxun]

  I use jsp in tomcat to access the remote ejb in jboss,the code like this :

         Hashtable environment = new Hashtable();
         environment.put(Context.INITIAL_CONTEXT_FACTORY,
                "org.jnp.interfaces.NamingContextFactory");
        environment.put(Context.URL_PKG_PREFIXES,
                "org.jboss.naming:org.jnp.interfaces");
        environment.put(Context.PROVIDER_URL, "jnp://127.0.0.1:1199");
       InitialContext mycontext = new InitialContext(environment);
        Mysource temp = (Mysource)ctx.lookup("MysourceBean/remote");

  But i am confused that it seems anyone can access my ejb if know the jnp address and method name.

  Is there a way to secure the link?

Thanks.