Apple Devices not compatible with coova

I am have my coova hotspot working perfectly for androids and other devices, the problem is when i use an Iphone, ipod, ipad, mac or any apple device, i select the wi-fi corresponding to my hotspot and then a captive portal opens from apple devices (CNA) but it immediately kicks me out. for other devices when i select the wi-fi it opens a page in the browser which allows me to login fine.

i tried putting the domains in the walled garden and the uamallow but when i do that, the apple captive portal doesnt appear not even quick like before and tells me i cannot connect, i want to be able to connect with that apple network assistant for apple devices and make my coova compatible with apple devices.

Thanks