Like everyone else here I have a Lennar-provided ICX 7150 and two APs. Something happened over the weekend and the ICX started showing up as Disconnected in the Unleashed GUI. Symptomatically things were 'connected', but traffic through the ICX to our ISP's stupid combo modem/router was having lots of issues.
I searched around on these forums (before finding the Lennar-specific section) and found some people with similar problems getting an ICX to connect to Unleashed. I tried factory resetting the ICX and re-adding it, but that didn't work. The ICX shows up in Unleashed as Pending, then prompts to enter the IP to join it (Auto Approve is enabled but seems like the ICX is in 'Router' mode per the docs?).
No matter what I have tried, after approving the ICX, it tries connecting and then shows up as Disconnected with a message that the ICX could not be pinged.
I also updated the ICX to 08.0.90f via TFTP, but the result was the same.
I verified that LLDP is fine between the ICX and APs, but ICMP is not. I indeed can't ping the ICX from the AP, but I can ping it when I'm on the wired network from the ISP router. Interestingly when I'm connected to the router, I can't ping the AP directly. I can ping the AP if I'm on the wifi network being broadcast by Unleashed, but then I can't ping the ICX.
I know that was pretty hand-wavy but I can clarify if needed.