The error message is due to a minor bug in Ping. You may interpret this message as meaning that the SNA is healthy and deployed, but is not running any services yet.
You can bypass this issue entirely by designating (at makebootconfig time) the SNA that will host the first Admin, and running the boostrap Admin only on that one SNA.
You can avoid running the bootstrap Admin by omitting the "-admin <adminPort>" option on the makebootconfig command line. If you give -admin for only one of the SNAs, then ensure that this SNA is the first to be deployed (and hosts the first Admin), then I think Ping would work correctly for your other SNAs.