hi @swift-wire-76908 , basically 404 error means the url points to something does exist, or there is no backend server listening on that url and port, which sound like a network layer issue rather than Rancher's. I'd suggest to check the network configuration, such like DNS service like route 53 or the load balancer, to make sure that the traffic is routed to the local k8s cluster. Also, if your k8s cluster is accessible from the internet.
Another thing I would like the check is if the the hostname is set to that url when you install Rancher via Helm.