6.6.5 Note on transmitting/receiving events to/from earlier event server versions
Earlier versions of event servers (version 5 and earlier of JP1/SES or JP1/AJS, and programs that use the JP1/SES protocol) are only able to receive events from IP addresses that are obtained using the network functionality (gethostbyname) managed by the OS.
When you transmit/receive events between an earlier version of the event server and JP1/Base, deploy the event server on a host in a network that uses an IP address obtained by gethostbyname. If you deploy an earlier event server on another type of host, it can transmit but not receive events.
Note that you cannot communicate with earlier event servers using IPv6 addresses.