For those who have an iOS device such as an iPad or and iPhone you can enable Wi-Fi syncing between your mobile device and iTunes. This means you don’t have to plug your device in to sync it between your Mac. The majority of the time, after you have enabled the service, it will work perfectly. However, every so often it will not work. You may have tried disabling and re-enabling the option in iTunes or restarting both your Mac and your iOS device. There are some tips on the net that show you how to restart the mobile service, however this may not work. If you have tired all options this tip may work, I had great success.
Enabling Wi-Fi Syncing When All Else Is Lost
The syncing ability on Mac OS X and iOS has a lot to do with your Wi-Fi settings. The secret method I have found is to enable an option called ‘link-local’ within the network settings.
To access this setting open up System Preferences and select the Network pane. Select your Wi-Fi network and press the advance button in the bottom right corner. From the advance options select the TCP/IP tab. Half way down the list there will be an option to configure IPv6, the next generation of technology to address your computer on the internet. From this configuration drop down list select ‘Link-local only’.
You will need to restart your Mac to enable the effect. When you restart and re-open iTunes your iOS device should appear within the sidebar or menu list and allow your to sync over Wi-Fi.
Let me know if this setting works for you. It may just work out of coincidence.