Kubernetes dashboard showing Unauthorized
run kubectl proxy command with --accept-hosts option
kubectl proxy --address="172.20.22.101" -p 8001 --accept-hosts="^*$"and it will work fine.
Note: this is not recommended for production grade kubernetes clusters, since you're accessing the dashboard through plain http.
More secure alternative is to run access the dashboard through ssh tunnel like this.
in one terminal run:
kubectl proxy in another terminal run a ssh tunnel to localhost:8001 (the default kubernetes dashboard port)
ssh -NT -l SSH_USER -p SSH_PORT K8S_CONTROLLER_IP_ADDR -L 8001:localhost:8001