IOS 6 update - cannot connect to wifi with proxy

We have 300 IPad 2's to configure and they cant connect to our wifi.  Since the upgrade we can no longer connect our proxy network as we did before.  We use an explicit proxy where we manually enter the proxy address.  WPA2 Security.  We contacted Apple support and after an hour they said they didn’t know how to resolve the issue and needed to research.  This was 5 days ago so im reaching out to the Apple community.  We contacted our proxy support BlueCoat and they have escalated the issue to their top level support.  After the iOS 6 update we are basically dead in the water.  
We select DHCP under our network settings and select Manual under the http Proxy settings.  After filling in the Server, port, authentication info and try to connect, it immediately brings up a safari page that states "Error Opening Page - Hotspot login cannot open the page because it could not connect to the server".
The other issue we have even with iOS 5 is we could not connect to https sites.

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.

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    ~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~
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