Why does configuring the ApplicationRealm security-realm to defer to JAAS cause my remote EJB client to fail on JBoss EAP 6?

Issue

• Why does configuring the ApplicationRealm security-realm to defer to JAAS cause my remote EJB client to fail on JBoss EAP 6?
• Having verified that the JAAS login module is getting invoked correctly on the server side. However, the client fails with the following exception:

WARN: Could not register a EJB receiver for connection to localhost:4447
java.lang.RuntimeException: javax.security.sasl.SaslException: Authentication failed: all available authentication mechanisms failed
    at org.jboss.ejb.client.remoting.IoFutureHelper.get(IoFutureHelper.java:91)
    at org.jboss.ejb.client.remoting.ConfigBasedEJBClientContextSelector.setupEJBReceivers(ConfigBasedEJBClientContextSelector.java:119)
    at org.jboss.ejb.client.remoting.ConfigBasedEJBClientContextSelector.<init>(ConfigBasedEJBClientContextSelector.java:76)
    at org.jboss.ejb.client.EJBClientContext.<clinit>(EJBClientContext.java:77)
    at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:120)
    at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:104)
    at $Proxy0.sayHello(Unknown Source)
    at jboss.example.ejb.HelloClient.main(HelloClient.java:23)
Caused by: javax.security.sasl.SaslException: Authentication failed: all available authentication mechanisms failed
    at org.jboss.remoting3.remote.ClientConnectionOpenListener$Capabilities.handleEvent(ClientConnectionOpenListener.java:315)
    at org.jboss.remoting3.remote.ClientConnectionOpenListener$Capabilities.handleEvent(ClientConnectionOpenListener.java:214)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72)
    at org.xnio.channels.TranslatingSuspendableChannel.handleReadable(TranslatingSuspendableChannel.java:189)
    at org.xnio.channels.TranslatingSuspendableChannel$1.handleEvent(TranslatingSuspendableChannel.java:103)

• Secure EJB client access fails with the following exception:-

Caused by: javax.security.sasl.SaslException: Authentication failed: all available authentication mechanisms failed