Looking at your configuration your inbound communications over Remoting are making use of the MyAppRealm - this realm needs to be updated to reference the JAAS domain that you have defined, here is an example of how to reference a JAAS domain from a realm: -
<security-realm name="ManagementRealm">
<authentication>
<jaas name="darrans-domain" />
</authentication>
</security-realm>