Check the log to see if there is a failure to bind to the address. Should that be the case, look for the problem in the network configuration. There are several posts regarding the binding problem in these forums. However, some log messages would be useful otherwise we're all working in the dark.
Thanks for the quick reply jonlee, it turned out that the box had problems with DHCP and couldn't find its own host name. After hard-coding a reference into the /etc/hosts file, all was well, and JBoss happily started.
Thanks again for your help!