We have a WLAN Controller 4402, with firmware version 18.104.22.168. The ports are connected to 2 separate switches. 'ap-manager' is on port 1, and 'ap-manager 2' is on port 2. The wireless network is running fine when both ports are connected. However, when I disconnect port 1, the client be disassociated, then re-associated, but unable to grab DHCP IP address. I have also assigned a static IP address on the client, but is unable to ping anywhere, not even the gateway. From what I understand, the ports should be able to backup each other in case of failure, but the HA does not seem to work. What could be wrong?