iOS application’s service discovery depends on Apple’s Bonjour technology, and on some WiFi routers that won’t always work.
- First, make sure that you have installed all the updates for both applications.
- Sometimes turning iPhone’s Airplane mode on and off would make the application find synchronization server that is running within the Mac application.
- Another cause of such problems on the WiFi router could be: 'you probably have multicast on WiFi disabled’. That one would require some tinkering with options in your WiFi router in order to enable that option.