If running the HADB management agent on a host with multiple network interfaces, the createdomain command may fail if not all network interfaces are on the same subnet:
hadbm:Error 22020: The management agents could not establish a domain, please check that the hosts can communicate with UDP multicast.
By default, the management agents use the “first” interface for UDP multicasts (“first” as returned by java.net.NetworkInterface.getNetworkInterfaces()).