We have huge issues with iOS 11. Any apple device that upgrades to version 11 or greater (up to 11.0.3) will just not connect to our network. We have about 800 devices that connect at various times of the day to 59 Unifi devices. Anything prior to OS11 works fine, android, PC work fine too.
The iOS 11 devices join the network and then within a few seconds drop the network. We are using a Smoothwall Firewall with UTM and the certificate along with Windows Server 2012 as our DHCP server.
I have spent hours on this and not got anywhere. Anyone able to help please?