You must be running the all configuration. The service you are referring to can be found within the remoting-service.xml of the server/all/deploy directory.
You can either remove the remoting-service.xml altogether (if you are not using AOP remoting or EJB3) or can just comment out the mbean section for the MulticastDetector.
Thank you for responding, Tom. I apologize that I should have posted this in a JBoss Users forum, but I wasn't sure which would be appropriate.
I've removed the remoting-service.xml file from the all/deploy directory and our problem was solved.