It doesn't try to contact anybody. When you run using the "all" configuration (run -c all) clustering is enabled, so jboss will use UDP multicast to try discover peer nodes inside the same LAN to form a cluster.
If you don't want this, just use a non-clustered configuration (e.g. the "default").
Thanks. I won't worry about the hacker aspect.
However, I think took the default, and it's still doing it anyway. At least, I show "default" in the IDE "Server Configuration" in the Debug Console of the JBoss Eclipse IDE Home tab.
I'd like to stop the multi-casting simply because I don't need it.