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.
Thanks for the help. So far I have tried everything I have seen posted short of a full restore. This includes resetting all network settings, resetting router, auto http proxy, clearing safari data and cookies, and forgetting networks. As for resetting the router channel or wpa, I can do this at home, but I obviously don't have the option of resetting the rest of the worlds routers that I may want to connect to. As my wifi reception acts the same regardless of the network I am connected to. Hoping to get this remedied as quickly as possible, as my wifi only iPad 2 (64 g) has been rendered virtually useless!
Thanks again for your replies.
@TexasMacMan - You replied to a similar post by me regarding the ios6 iPad3 wifi issues but it was deleted by apple before I could reply. Thank you so much for the info you provided. Although it didn't fix my problem completely, I am able to sustain wifi connection for longer periods of time. Clearing safari history & deleting cookies keeps me connected for an entire day. Thanks So Much!
I can confirm Andrews problems - my wifes iPad 2 is experiencing the exact same issue. I am typing this on my Macbook Air, on the home wifi network, and the iPad cannot see it or any of the neighbours networks at all. Even manually entering the SSID and security details it will not connect. I have done the usual power down and network reset steps - to no avail. We tried using the iPhone as a personal hotspot, and the iPad connects fine to it (sharing the iPhones connection via wifi, not bluetooth) - so thats a viable workaround for us - not sure if it works for Andrews case.
I don't really mean to reply to the original post but this is what I have to do during the last couple of days. First of all, the issue isn't really with the IOS 6 upgrade. At least not for me. After attempting the usual fixes that I have read in various threads, I finally had to have Comcast come out. We did have a much older modem and a fairly old router. Once he replaced that with the newer Arris, I connected without a hitch! So, I am thinking that the majority of folks might want to look to their own routers and modems and perhaps download the latest firmware. I couldn't do that because there simply wasn't an upgrade. So, I now had connectivity but Apple applications would not accept my password no matter how many times I tried. Long story short, I had to dis-enable my Firewall, reset password again and it worked. Then went back in and enabled Firewall settings. Anyway, just thought I would throw this out there as I know there are a slew of posts about these issues.