When starting server on AIX it throws exceptions:
java.net.BindException: The socket name is not available on this system.

The issue is some confusion with IPv6, because -Djava.net.preferIPv4Stack=true fixes the issue.

Currently run.sh adds the option by default for linux. But I wonder if we shouldn't have it by default for all OSes and optionally turned off by a command line switch or environment variable. Another solution is to just add "AIX" to the have_it_by_default list.