The list of domain where the plugin send the "ping" is either defined automatically or you can force specific value yourself when you select specific domains.
So if you don't want that the "ping" is sent to
www.arcanewonders.com
but on
www.magewars.com
You can change the setup of the plugin to provide a specific list of domains.
When you use the automatic domain computation, the plugin use the definition present in JMS to compute the domains where must be sent the "ping".
This is based on the shared user definition that you have setup when building the slave site.
Go in the plugin / system / SSI for domain and update the setting to provide a specific list of domains.