I have created a Kubernetes cluster in the cloud- using this tutorial and deployed to the cluster a backend application called chatapp from the Docker private registry. Since there is no option to include service type as LoadBalancer, I had to restore to NodePort type. Here is the chatapp-deployment.yml file for reference:

apiVersion: v1
kind: Service
metadata:
  name: chatapp
spec:
  selector:
    app: chatapp
  ports:
  - protocol: "TCP"
    port: 6443
    targetPort: 3000
  type: NodePort
  externalIPs:
  - A.B.C.D

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: chatapp
  labels:
    app: chatapp
spec:
  replicas: 2
  selector:
    matchLabels:
      app: chatapp
  template:
    metadata:
      labels:
        app: chatapp
    spec:
      imagePullSecrets:
      - name: regsecret
      containers:
      - name: chatapp
        image: sebastian/chatapp
        imagePullPolicy: Always
        command: ["/bin/sh"]
        args: ["-c", "while true; do echo hello; sleep 10;done"]
        ports:
          - containerPort: 3000

Note: I removed the external IP for security reasons.

I had to assign external IP manually since I couldn't set-up LoadBalancer as service type. Whenever I try accessing http://A.B.C.D:6443, I get the following:

Client sent an HTTP request to an HTTPS server.

I went through this link but couldn't fix my issue with it. The external IP I have used is from the master-o.

While trying to access it with https://A.B.C.D:6443, I get the following 403 message:

{
  "kind": "Status",
  "apiVersion": "v1",
  "metadata": {
    
  },
  "status": "Failure",
  "message": "forbidden: User \"system:anonymous\" cannot get path \"/\"",
  "reason": "Forbidden",
  "details": {
    
  },
  "code": 403

How can I authorize access to my cluster? Any feedbacks and suggestions would be appreciated.