IOS6 Devices Reject WiFi connections

Question

Ok so after loading iOS6, it looks like when you add a WiFi connection to your Iphone or Ipad, it verifies the WiFi connection with some page off the Apple.com website. When unable to do so it drops the WiFi connection you are trying to add.
Example at I am experiencing is when adding any device running iOS6 to a LAN (MBRN3000 Netgear router) although the device see the WiFi connections perfectly, they allow you to enter your security key and then run off to verify your "internet connection" on the apple.com site. If I have not plugged in a 3G dongle and connected the netgear router to the internet I get routed to the routers default setup page.
The only option I have then is to click cansel, and wooosh the WiFi connection I was adding is dropped.....
But, if I first connect that router to the internet with a 3G dongle, then any and all the devices are able to verify the connection and add the WiFi connection with no problem at all...
So just how does one add the WiFi connection if you don't have an internet connection ? and yes there are places when it is still impossible to be connected.
We run a L.A.N onboard a vessel which operates 160Kms offshore. The Lan is designed to supply video streaming (via Airvideo) from a workstation via the Netgear WiFi router to a group of divers within a saturation compression chamber. 
The divers have all purchased Ipads, which allows them to view videos while locked inside the chamber for 28days continuously.
Obviously it only works when they can add the WiFi and thus stream the video, which at the moment seems impossible without the router having an internet connection.
P.S all the Ipads did this without a problem before iOS6 was loaded onto them, and the one we haven't loaded iOS6 on still works.
The divers with Samsung tabs work fine via this system.

Answer 1

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
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iOS 6 Wifi Problems/Fixes
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
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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
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
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
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/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.
https://discussions.apple.com/thread/4010130
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.
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If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom