HA cannot contact Home Assistant Update

OS: Armbian 5.85 stable Debian GNU/Linux 9 (stretch) 4.19.42-meson64
System: Odroid C2
HA Version: 0.93.1 and 0.93.2

We receive this error:

ERROR (MainThread) [homeassistant.components.updater] Could not contact Home Assistant Update to check for updates

There is no information in home-assistant.log about trying to update. As a result of this error, I must check for updates manually.

The odroid host for HA is open internet outbound on the pfSense firewall only for TCP ports 80 and 443 and inbound on TCP 443. The odroid is configured statically and uses the DNS resolver on the pfSense firewall/gateway.

Is there some log I don’t know about that might give me a clue about the why HA can’t check for updates?