I have updated my iPad 2 to ios5 and iTunes on pc to 10.5. When ad is connected via USB I check the enable wifi sync on the summary page of my iPad. When I disconnect cable and plug iPad into power, the sync now under wifi sync remains greyed out. I have been browsing the Internet for solutions, of which none have worked. I am on a Verizon fios router, not sure if that matters. I even went as far as to disable the firewall and enable tdp ports 123 and 3689 and udp ports 123 and 5353 for iTunes specifically. Still greyed out. Any help?