I have a Kubernetes cluster with an Ingress controller deployed. All external apps are hitting pods via this controller using their URI names and port 443.

I have a client with an external app that needs to talk to a relay app inside of our cluster on a defined port (can't use 443). I would just expose the service the app is in using NodePort, but the required port is well outside of Kubernetes range (52311). I've done some googling and have seen that it's technically possible to increases this range but I don't want to do this and I haven't been able to bring up the apiserver component of the cluster when I make this change.

Anybody with greater experience of Kubernetes have an idea on how this could be done? Thanks