I know it is possible to enable Proxy protocol for Ingress (also by service annotation):
service.beta.kubernetes.io/do-loadbalancer-enable-proxy-protocol: “true”

That works great with Proxy aware services like my web applications running on port 80 (http) and 443 (https)

However, for services like SQL Server running on tcp port 1433, connecting to that service works when proxy protocol is disabled, and doesn’t work when proxy protocol is enabled.

Is there a way to enable and disable Ingress Proxy for individual ports, e.g. to be enabled for ports 80/433 and to be disabled for other tcp ports (e.g. port 1433)?

My only solution now is to have two-ingress-services and two official IP-addresses and that will of course also cost the double a month.

Here is how I setup Ingress using helm chart:

helm install ingress-nginx --namespace ingress-nginx stable/nginx-ingress -f nginx-ingress-controller-config.yaml

nginx-ingress-controller-config.yaml:

controller:
  config:
    use-forwarded-headers: "true"
    compute-full-forwarded-for: "true"
    use-proxy-protocol: "true"
  service:
    annotations:
      service.beta.kubernetes.io/do-loadbalancer-enable-proxy-protocol: "true" 
    nodePorts:
      tcp:
        1433: 32496 # Any random port 30000-32767
tcp:
  1433: "sqlserver/mssql:1433" #namespace/service-name:port