This worked for me. Hope it helps.
I'm running Windows. I was having trouble with Wireless Sync, but the below info I got off of another forum solved it for me.
The below instructions are for Window, so I'm unsure has to what the procedure will be for Mac.
Load up Services (you can do this by entering services in the search at the bottom left of the screen after you have clicked on the start globe).
Once in there look for the service called APPLE MOBILE DEVICE. When you find it right click on it and choose RESTART from the menu.
Download and install Bonjour Print Services from Apple. Here is the link
http://support.apple.com/kb/DL999
After install, go to Windows Control Panel->Windows Firewall->Advanced settings->Inbound Rules
Find any entries for Bonjour Service, and see what it says under "Profile". If it says "Public", that could be your problem. Double-click each entry, goto advanced tab and enable Private and Domain.
Restart iTunes, now you should be able to wireless sync your iDevices.