The Apple eco-system – iOS devices and OSX systems – seems to have a few problems with wi-fi connections, especially in the time just after upgrades. I have experienced this myself a couple of times, as I documented here on my blog.
Recently, I found a page on Apple’s Support site, which details Apple’s Recommended Wi-fi settings for iOS and OSX.
Below I’ve outlined the main recommendations:
- SSID – Any unique name
- Hidden Network – disabled
- MAC Address authentication or filtering – Disabled
- Security – WPA2 Personal (AES)
- Channel – Auto
I’d suggest checking the page on Apple’s Support site in full before making any changes to your wi-fi setups.
Note: Changing the security to WPA2 recently fixed my Wi-fi problems after the OSX upgrade to Mountain Lion.