replace 127.0.0.1 with whatever machine JBoss is running on if you are not on the same machine.
find the Shutdown service and click on it
find the Shutdown operation and click on it
whatta strange way to shutdown... :)
would'nt be on the "type=Server" object, then by acessing it and clicking on the "Shutdown" button?
If you're not using JBoss as a service, just run the "shutdown.bat" script that is on the "bin" directory.
Let us know if any of these sugestions help ya.