I am getting 502 Bad Gateway nginx/1.13.9 for my angular app when accessing in the browser in k8's. My service and ingress is as below.

Angular app pod logs show all successful and in-fact port forwarding is working fine. This same image is also working fine in my local machine with docker.

From k8s logs, I could see this:

[error] 1534#1534: *32272457 SSL_do_handshake() failed (SSL: error:1408F10B:SSL routines:ssl3_get_record:wrong version number) while SSL handshaking to upstream

Service:

Name:              test-portal
Namespace:         testproject
Labels:            app=test-portal
                   chart=test-portal-1.0.0
                   environment=dev
                   heritage=Tiller
                   release=test-portal
                   version=dev
Annotations:       <none>
Selector:          app=test-portal,release=test-portal
Type:              ClusterIP
IP:                x.x.x.x
Port:              <unset>  80/TCP
TargetPort:        4200/TCP
Endpoints:         x.x.x.x:4200
Session Affinity:  None
Events:            <none>

Ingress:

Name:             test-portal
Namespace:        testproject
Address:
Default backend:  default-http-backend:80 (<none>)
TLS:
  SNI routes test-portal.us-west-2.xxxxx.xxxxxx.delivery
Rules:
  Host                                                       Path  Backends
  ----                                                       ----  --------
  test-portal.us-west-2.xxxxx.xxxxxx.delivery
                                                             /  test-portal:80 (<none>)
Annotations:
  secure-backends:  true
  ssl-redirect:     true
Events:             <none>

Ingress Config map

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    ingress.kubernetes.io/secure-backends: "false"
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{"ingress.kubernetes.io/secure-backends":"false","kubernetes.io/ingress.class":"nginx"},"labels":{"app":"test-portal","chart":"test-portal-1.0.0","environment":"dev","heritage":"test-portal","release":"Helm","version":"1.0.0"},"name":"test-portal","namespace":"testproject"},"spec":{"rules":[{"host":"test-portal.us-west-2.xxxx.xxxxxxxxx.delivery","http":{"paths":[{"backend":{"serviceName":"test-portal","servicePort":80},"path":"/"}]}}],"tls":[{"hosts":["test-portal.us-west-2.xxxx.xxxxxxxxx.delivery"]}]}}
    kubernetes.io/ingress.class: nginx
  creationTimestamp: 2020-01-08T11:24:18Z
  generation: 1
  labels:
    app: test-portal
    chart: test-portal-1.0.0
    environment: dev
    heritage: test-portal
    release: Helm
    version: 1.0.0
  name: test-portal
  namespace: testproject
  resourceVersion: "2379156945"
  selfLink: /apis/extensions/v1beta1/namespaces/testproject/ingresses/test-portal
  uid: 6925819b-3209-11ea-80fb-02fb0c9060d8
spec:
  rules:
  - host: test-portal.us-west-2.xxxx.xxxxxxxxx.delivery
    http:
      paths:
      - backend:
          serviceName: test-portal
          servicePort: 80
        path: /
  tls:
  - hosts:
    - test-portal.us-west-2.xxxx.xxxxxxxxx.delivery
status:
  loadBalancer:
    ingress:
    - {}