@Clive_A I have the controller connected via management vlan 4090. I have no ACLs setup between VLAN 1 and VLAN 4090, I'm able to ping between the subnets setup on each vlan. Does the controller have...

I tried both custom and the latest beta version of the firmware. I've enabled DPI via: Settings > Network Security > Application Control > Deep Packet Inspection Statistics>Application Analytics...