Hi, after upgrading to IOS6 I have been having the same problem with my Ipad 2 and Netgear MBRN3000.
Previously everything was working fine.
Now, none of the solutions above seem to work at home and obviously I don't have control of wifi configurations around the world. In any case my personal router's settings are fine and I am not willing to change them.
I have also tried resetting the device a number of times.
So finally this is not my problem or routers problem this problem is due to apple (notice the lower case a) and it's faulty, buggy, ****** IOS6 release.
PLEASE SOLVE THE PROBLEM ASAP AND POST AN UPDATE!!!!
iOS 6 Wifi Problems/Fixes
Fix For iOS 6 WiFi Problems?
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
Apple's iOS 6 Wi-Fi problems
Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
How to Fix: My iPad Won't Connect to WiFi
iOS: Connecting to the Internet
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
Unable to Connect After iOS Update - saw this solution on another post.
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
Okay, so wifi worked after going through all three of these solutions for the day. I went to work and it connected to my network there. I came home and could not connect. I had to go through all of these solutions again. After finally connecting after the 3rd time through, It lasted until I shut the lid on my iPad. When I went to use it, no wifi....