IPad mini iOS 6.02 cannot connect to Sitecom 300N

Question

I have been trying (unsuccessfully) to connect a new iPad mini, updated to iOS 6.02 to a Sitecom 300N WLR-3000 router. I have done all the obvious things, like resetting the router, etc, but no success whatsoever. In the same house, there are two iPad2 and a MBA from 2009, all of which connect successfully to that router, so the problem seems to be a miscommunication between iPad mini's broadband chip and the chip in the router.
The router's basic settings are:
Mode: AP (choice between AP and WDS)
Band: 2.4GHz (B+G+N)
Channel 11 (you can't set Auto, you have to choose a channel)
The router's advanced settings for wireless are:
Any tips what I can do without damaging the connectivity of the other systems? Maybe anything I can do at the mini's side to make it work? It seems a mismatch between the chipsets to me.
Thanks,

Answer 1

Our school is having a similar problem with the iPads that were updated to iOS6. We don't use a proxy but we have a Sonicwall and the user has to login to the Sonicwall before the device can have Internet access.
Here is what I have found and maybe it will help you. The problem (for us) is that immediately after the iPad is connected to our Wifi it tries to contact the Apple servers in California. This connection is blocked by the firewall because the user has not had the opportunity to login to the firewall. The iPad opens a screen that is not part of Safari to allow the user to log into the firewall but they can't because a pop-up window is needed and this application has no settings to allow pop-ups. Under normal circumstances the user would open Safari and login but if we try to switch to Safari it cancels the connection attempt and disconnects from the Wifi. Obviously, this means we no longer have a connection to our Sonicwall. 
The trick I am using to make it work is this. (Keep in mind, we don't normally use proxy settings). I set the http proxy setting for the particular network to AUTO. This causes enough confusion in the iPad that, if I am quick enough, I can open Safari and log into the firewall real quick. Once that is done it will work fine....until the user goes to a different access point.