Are you getting an exception? Maybe, the firewall is blocking port 1099 which is the default jnp port. If this is the case, either configure the firewall to permit this port or change the port jboss uses for jnp. Or course, if you change the port number don't forget to make the changes on you client, also.
No, I think I have a firewall problem, because the server log is empty. Required firewall ports are opened. Any ideas ?