I moved to iOS 6 and when my phone came up it could not connect to my home network. I did the following on the phone:
- Updated phone to iOS 6 from 5.1.1
- I thought maybe the network settings were messed up so I "forgot" the network and tried again, no luck.
- Reset all network settings, no luck.
- Full restore of iOS 6 and setup as a new phone (no data/apps/etc restored), no luck.
- Removed all encryption on my access point, no luck.
So I then setup a spare access point I had and the iPhone connected right away (even with the same SSID and encryption as my normal home access point). This indicates an incompatibility between iOS 6 and my access point.
It is not an encryption issue, because it can connect to an open, WEP, and WPA2 configuration on my spare access point without a problem. It can even connect to my Mini that is performing Internet Sharing.
The access point is a Netgear WG102 and before iOS 6 my iPhone 4S worked great on it. I also have an old 2gen iPod Touch, 1st gen iPad, Macbook Air, Mac Mini, etc, etc, etc on the access point with no issues. It's just my iPhone and iOS 6 that can't connect to it.
I did the following to the access point:
- running latest/greatest firmware
- changed RTS threshold, Frag length, Beacon Interval, DTIM interval, etc, with no luck.
- enabled WMM with no luck (which I saw fixed someone elses issue with a beta version of iOS 6 and their iPad)
- hard/factory reset of the access point (phone can't connect to the default and wide open "Netgear" SSID when it comes up)
The phone works on all other access points that I have tried outside my house.