As the title says: iTunes won't sync via cable or over wifi. I have tried restarting my MacBook, iPad, and iPhone. I deleted all the backups for the idevices. I reset the warnings. I cannot transfer any of the apps off either. What am I missing? OSX 10.10.4 on my MacBook and iOS 9 on the two problem children. iTunes is at 12.1. I know there is 12.3 out and haven't grabbed it yet. I don't see that as an issue as this a reoccurring issue I have had on all idevices and iOS version back to iOS 6.