I have an NGFW instance behind a 4G LTE "router" that has an outbound port filtering capability.

When trying to access the appliance from Command Center, I get:
"Unable to establish connection to the appliance. (0,0) User SSH exited with error [255] Output: ssh: connect to host sshrelay.untangle.com port 22: Connection refused"

What I am seeing so far is that Untangle NGFW works best with unfettered access to the internet,
But I see that it needs (at least) the following ports open outbound:
TCP 80 - http
TCP 443 - https
TCP 22 - SSH
UDP 123 - NTP
UDP 1194 - OpenVPN

I just thought i would leave this here.