About CPX server thread

When I set up a ZB net work with CPX(connect port X2,X4,X8), I find that “Digi embedded kit gateway viewer” couldn’t find the devices frequently.
here is the “ConnectPort X8 Configuration and Management” :

Configuration ->XBee Network->Network View of the XBee Devices, I Clear list before performing refresh, and many Devices were found.
Management ->Connections ->Active System Connections , there are only two Python threads started

So what can I do with the problem?

Follow this article to the letter: