I'm using Rancher Desktop 1.4.1 on M1 Mac, and using Moby. I'm just trying to connect to the host application from container. I think I'm missing something super simple. I run

docker run -it --rm --add-host=host.docker.internal:host-gateway debian:latest bash

and on the host side, I'm running

python3 -m http.server 9876

. So on the container, I installed telnet and

telnet host.docker.internal 9876

but unable to connect. What am I missing?

Please try it without the

--add-host

option; the name should already be defined inside the container. And on macOS the address will always be

192.168.5.2

, so you could try that as well, but

host.docker.internal

should already be an alias for it.