Some things to try first:
1. 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.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. 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
4. Go into your router security settings and change from WEP to WPA with AES.
5. Renew IP Address: (especially if you are droping internet connection)
• Launch Settings app
• Tap on Wi-Fi
• Tap on the blue arrow of the Wi-Fi network that you connect to from the list
• In the window that opens, tap on the Renew Lease button
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
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
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
How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
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.
Tom, I should have mentioned that I tried 1 and 2 but was unsuccessful. I was about to try 3 when I remembered having to contact CableOne (tv and internet provider) to get on with iPad 3G. So I called them again, and he took your suggestion to change channels, and also changed the name and password. I don't know if all that was necessary, but it was successful.
Of course, I had to change the settings on the 3G and the Apple TV, but all is good now.
So weird… I think Comcast San Francisco coincidentally upgraded the firmware (thanks for prohibiting me from managing my own firmware! ) on my Motorola SBG6580 to 18.104.22.168-GA-00-488-NOSH around the same time my iPad mini stopped being able to join my Wi-Fi network at 2.4 GHz. I systematically tried:
- Power cycling the router
- Toggling Wi-Fi on the iPad mini
- Power cycling the iPad mini
- Resetting Network Settings on the iPad mini
- Toggling WPA2-PSK security
- Changing the Network Name (SSID)
- Toggling 802.11 "n-mode"
- Toggling 802.11 "N Support Required"
- Toggling Bandwidth between 20 and 40 MHz
- Changing Control Channels
- Toggling STBC Tx
- Toggling WMM Support (Apple recommends to leave it enabled)
- Erasing All Content and Settings on the iPad mini
The only change that reliably lets my iPad mini join my network now is to use the 5 GHz band, which gets less penetration so I may have to reposition the SBG6580… Anyhow, I thought I'd share my experience since I didn't find any solid solutions online, but did find lots of rampant speculation (e.g. Apple IPv6 conspiracy ).
P.S. I guess I should add that my iPad mini works with IPv4 just fine.
The Genius Bar reflashed my firmware to 6.0.1, but it still didn't work. (We did figure out that my iPad mini could connnect to a 2.4GHz Wi-Fi network without password protection.) I also tried iOS 6.1 beta 4 to no avail. Thus, the Genius Bar wound up replacing my iPad mini with a new one that works great.