ISE CWA redirection problem for Apple devices

Hi,
I'm testing some guest scenarios (CWA) in my lab using ISE1.3 and WLC2504 (7.6.130).
I have noticed that redirection to ISE portal doesn't work for apple devices (iOS 7 and later).All other devices like laptops,androids etc work fine.
Seems that the workaround on WLC that bypasses the CNA on iDevices doesn't work in my case.The device tries to open the ISE portal and shows just a blank page (attached photo)
The problem doesn't appear for devices with iOS 6 but only for newer versions.
I've also tried with version 8.0 on WLC without success.
Any advise?
Regards. 

Captive portal/wispr support for apple ios7
CSCuj18674
Description
Symptom:
When attempting to access the Guest Portal with an Apple iOS 7 device while the WLC "Captive Portal Bypass" feature is enabled, the web sheet on the device still appears, preventing the user from continuing the flow.
Conditions:
The Apple device is running Apple iOS 7.
Workaround:
In the ACL on the WLC used for captive portal redirection and exemption of special traffic for the Guest Portal, add exemptions for the IP resources that resolve from "www.appleiphonecell.com" and "captive.apple.com" FQDNs.
IMPORTANT NOTE: These IP addresses are associated with the FQDNs of "www.appleiphonecell.com" and "captive.apple.com" and are subject to change by the entities hosting those domains. If the IP addresses do change, the ACL would need to reflect that.

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