Ingress error: Cannot connect to host 172.30.32.1:62348 ssl:None [Host is unreachable]

Node-RED and ESPHome web interfaces don’t work. Thety report 502: Bad Gateway.

I don’t know why. Every time I try to open Node-RED or ESPHome, I see this error in the System log:

Ingress error: Cannot connect to host 172.30.32.1:62348 ssl:None [Host is unreachable]

I don’t know how to troubleshoot or fix this problem.

HASS.io latest version running on Ubuntu 16.04 in Docker container. Portainer and Visual Studio Code both work as expected.

I can get to Node-RED using the the old method (http://server:1880) but it prompts me for plain text username and password. If I use my HA credentials, I can get Node-RED open, but Ingress is supposed to eliminate this requirement.

What now?