iTunes WiFi Sync only works when connected to computer
Maybe I'm not understanding iTunes WiFi Sync correctly, but I assumed that it worked as long as my iPhone was plugged into any power outlet and was connected to WiFi and my MacBook Pro was turned on. All these conditions are met, but iPhone is claiming that it can't find my MacBook Pro and it will continue the sync when my MacBook Pro is available. I've tried soft resetting and hard resetting the iPhone and restaring and shutting down and restarting the MacBook Pro but to no avail. Am I misunderstanding iTunes WiFi Sync? Do I have to connect the iPhone directly to the MacBook Pro for it to work? If not, what else can I try?
iPhone 4, iOS 5