Apple iOS devices receive a captive portal popup, but the wireless network is not configured to do this...

Question

Since the latest AP firmware update (11.0.007), my iOS devices are having trouble staying connected to the wireless network (Bridged, 2.4 & 5GHz via AP50s). Additionally, when they fall off, after sleeping, etc., and try to connect again, a faulty captive portal 
 
 After cancelling this dialog, the iOS device is then able to connect. The connection fails on sleep again and will not connect automatically. The same Captive Portal, Cancel, reconnect process is required to gain access to wireless once more. 
 Any help would be greatly appreciated.

Scott Klauminzer · Accepted Answer

Apparently my attempts to solve the Apple Store wireless connectivity issues caused this. 
 After blocking captive.apple.com outbound, the wireless network connects like normal. 
 Still have the apple store issue...