WiFi sync "computer not available"
I have downloaded io5 and the latest version of itunes. I have synced my ipad with the option checked for wifi sync. However, I cannot get the wifi sync button to ungrey on my ipad (or iphone for that matter) while connected to a pwer source. I can access the itunes library over home sharing. How do I make my computer available for sync?
iPad 2, Windows 7