I have an Instant cluster consisting of one IAP-345 and a bunch of IAP-305s I am trying to upgrade. Currently the virtual controller shows it's running 8.4.0.5_xxxxx firmware. When I hit the 'Check for New Version' button on the web interface it kicks back a message saying "Received no response from server".
IP, default gateway, and DNS all look good. I can ping outside IPs and URLs from the controller IP. NTP (as referenced in some other topics) seems to be working, as a 'show clock' gives me the right time. Not using AirWave or Central. I exempted the controller IP address from all filtering on our firewall just to rule that out with no change.
What am I missing here, or do I need to just punch in the URL to get these to update to the latest release?