ISE guestaccess - Android/iPad problem

Hi all,
I have a guestaccess using CWA on ISE 1.1.1 and WLC 7.2
The setup is realy simple with redirect ACL to ISE and after that an permit-all ACL.
Guest users are on a guest vlan and go thru a ASA to talk to DHCP, DNS and ISE.
When I try to connect with laptops, Windows 7, OSX 10.7 and 10.8, it works like it a charm.
The user gets redirected, put in credentials and after that get on the network. Not one problem out of maybe 30 tests.
But when I try smartphones and iPad it doesent work that well...
With iPhones, iOS5 and iOS 6 tested on three diffrent phones, I get access 19/20 times.
With iPad, only one with iOS 5.1, I get access maybe 50% of the tries
And with Android, two HTC with 2.3.7 and 2.3.3, I got one logon to the guest network out of 25 or more tries.
What happends when I try to access the network with a problem device is that it gets a redirect url but states,
on Android 'Web page not available' and on iPAD '..could not open page because it could not connect ot server.
On all these devices I can see that I have a DHCP lease with IP address and DNS. I have rebooted all devices several times and I have used 'forget this network' on the diveces.
I have also tried to removed the clients from the WLC and I have tried to turn off/on the WLAN on the WLC.
Could this be a WLC problem? I did a simple TCP dump on the ISE server but did not see any packets. (Need to do this one again..)
Anyone with some insight on guestaccess and mobile devices? :-)
Message was edited by: Mikael Gustafsson

While authenticating the guest through wireless its very important to check all the compatibility issues of the client with the NAC(Switch/WLC) device and ISE.Please check the below compatibitility matrix link along with some other links for assistance on your queries:
http://www.cisco.com/en/US/docs/security/ise/1.1.1/compatibility/ise_sdt.html
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns742/ns744/docs/howto_40_webauthentication_dg.pdf
http://www.cisco.com/en/US/products/ps11640/products_configuration_example09186a0080bead09.shtml

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