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@careful-apple-78995 I tried with port 80 and 443 on a clean ubuntu 18.04 node and it works:

$ docker volume create --name rancher-var-lib --driver local
$ docker run -d --rm -p 80:80 -p 443:443 -v rancher-var-lib:/var/lib/rancher/ rancher/rancher:stable
$ sudo docker run -d --privileged --restart=unless-stopped --net=host -v /etc/kubernetes:/etc/kubernetes -v /var/run:/var/run rancher/rancher-agent:v2.3.2 --server <https://192.168.64.45> --token kmktvc8tl878w6467b2ddxj7msjs4hsc4w895dpkf27pr9ttl4rj86 --ca-checksum 26e60e6be3326e3f0ed2e1f0528fa1d652006c68a1cd144ae67414efd7664b9d --etcd --controlplane --worker