I have a Kubernetes cluster where I deployed the following deployment and service:

apiVersion: v1
kind: Service
metadata:
  name: keycloak
  labels:
    app: keycloak
    name: keycloak
spec:
  type: NodePort
  ports:
    - name: http
      protocol: TCP
      port: 8080
  selector:
    app: keycloak
    name: keycloak
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: keycloak
  labels:
    name: keycloak
    app: keycloak
spec:
  replicas: 1
  selector:
    matchLabels:
      app: keycloak
  template:
    metadata:
      name: keycloak
      labels:
        app: keycloak
        name: keycloak
    spec:
      restartPolicy: Always
      containers:
      - name: keycloak
        image: jboss/keycloak
        ports:
          - containerPort: 8080
            protocol: TCP
        resources:
          requests:
            cpu: 200m
            memory: 256Mi
          limits:
            cpu: 400m
            memory: 512Mi
        env:
          - name: KEYCLOAK_LOGLEVEL
            value: "DEBUG"
          - name: PROXY_ADDRESS_FORWARDING
            value: "true"
          - name: KEYCLOAK_USER
            value: "admin"
          - name: KEYCLOAK_PASSWORD
            value: "password"
          - name: DB_USER
            valueFrom:
              secretKeyRef:
                name: postgres-secret
                key: username
          - name: DB_PASSWORD
            valueFrom:
              secretKeyRef:
                name: postgres-secret
                key: password
          - name: DB_ADDR
            valueFrom:
              configMapKeyRef:
                name: postgres-configmap
                key: HOST
          - name: DB_PORT
            valueFrom:
              configMapKeyRef:
                name: postgres-configmap
                key: PORT
          - name: DB_DATABASE
            valueFrom:
              configMapKeyRef:
                name: postgres-configmap
                key: DATABASE
          - name: DB_VENDOR
            value: "postgres"

The logs in my pod where keycloak is running are confirming that my keycloak is running and using the Postgres database that is provided. I try to add the following ingress rules:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: keycloak
  annotations:
    kubernetes.io/tls-acme: "true"
    kubernetes.io/ingress.class: "nginx"
    ingress.kubernetes.io/force-ssl-redirect: "true"
spec:
  rules:
  - host: auth.mydomain.com
    http:
      paths:
      - path: /
        backend:
          serviceName: keycloak
          servicePort: 8080
      - path: /auth
        backend:
          serviceName: keycloak
          servicePort: 8080

and I am able to get to the Keycloak home page, but once I click on administration console I keep getting the error: We're sorry .... HTTPS required. Setting the PROXY_ADDRESS_FORWARDING variable to "true", did not help to get it right. I don't just want to run keycloak on port 8443, so I am really looking for another solution than that.