I've had 16.4.1 installed for a couple months now on a self-supplied hardware, everything seems to work fairly well. My ISP has had some connectivity issues recently, and I've noticed when the ISP-WAN goes down, it is either very slow or completely non-responsive to try to log into the NGF appliance to check/monitor things. I'm suspicious that since the ISP router is still alive feeding the NG Firewall, it is not properly detecting loss of internet and attempts repeatedly to reach the data/licensing server (with no response) since the link outside the ISP router is down.

Anyone else see this issue?