OS version: ubuntu
Kubernetes: v1.17.3 dashboard : v2.0.0-beta8

I deploy the kubernetes-dashboard :

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml

my cluster info as shown:

Kubernetes master is running at https://10.104.12.1:6443
CoreDNS is running at https://10.104.12.1:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

After deploy the dashboard, the following are all fine.

NAME                                             READY   STATUS    RESTARTS   AGE    IP          NODE       NOMINATED NODE   READINESS GATES
pod/dashboard-metrics-scraper-76585494d8-qjw46   1/1     Running   0          4m1s   10.32.0.2   worker-3   <none>           <none>
pod/kubernetes-dashboard-5996555fd8-zgwzs        1/1     Running   0          4m1s   10.36.0.2   worker-2   <none>           <none>

NAME                                TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)    AGE    SELECTOR
service/dashboard-metrics-scraper   ClusterIP   10.96.0.196   <none>        8000/TCP   4m1s   k8s-app=dashboard-metrics-scraper
service/kubernetes-dashboard        ClusterIP   10.96.0.89    <none>        443/TCP    4m1s   k8s-app=kubernetes-dashboard

NAME                                        READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS                  IMAGES                                SELECTOR
deployment.apps/dashboard-metrics-scraper   1/1     1            1           4m1s   dashboard-metrics-scraper   kubernetesui/metrics-scraper:v1.0.1   k8s-app=dashboard-metrics-scraper
deployment.apps/kubernetes-dashboard        1/1     1            1           4m1s   kubernetes-dashboard        kubernetesui/dashboard:v2.0.0-beta8   k8s-app=kubernetes-dashboard

NAME                                                   DESIRED   CURRENT   READY   AGE    CONTAINERS                  IMAGES                                SELECTOR
replicaset.apps/dashboard-metrics-scraper-76585494d8   1         1         1       4m1s   dashboard-metrics-scraper   kubernetesui/metrics-scraper:v1.0.1   k8s-app=dashboard-metrics-scraper,pod-template-hash=76585494d8
replicaset.apps/kubernetes-dashboard-5996555fd8        1         1         1       4m1s   kubernetes-dashboard        kubernetesui/dashboard:v2.0.0-beta8   k8s-app=kubernetes-dashboard,pod-template-hash=5996555fd8

kubectl proxy --port=9999 --address='10.104.12.1' --accept-hosts="^*
quot;
Starting to serve on 10.104.12.1:9999

by connecting is fine: http://10.104.12.1:9999/api/v1/namespaces/kubernetes-dashboard/services

kind    "ServiceList"
apiVersion  "v1"
metadata    
selfLink    "/api/v1/namespaces/kubernetes-dashboard/services"
resourceVersion "986774"
items   
0   
metadata    
name    "dashboard-metrics-scraper"
namespace   "kubernetes-dashboard"
selfLink    "/api/v1/namespaces/kubernetes-dashboard/services/dashboard-metrics-scraper"
uid "d5c9d811-6efa-439c-af1d-58a7a7848dba"
resourceVersion "982160"
creationTimestamp   "2020-03-09T13:57:26Z"
labels  
k8s-app "dashboard-metrics-scraper"
annotations 
kubectl.kubernetes.io/last-applied-configuration    "{\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"labels\":{\"k8s-app\":\"dashboard-metrics-scraper\"},\"name\":\"dashboard-metrics-scraper\",\"namespace\":\"kubernetes-dashboard\"},\"spec\":{\"ports\":[{\"port\":8000,\"targetPort\":8000}],\"selector\":{\"k8s-app\":\"dashboard-metrics-scraper\"}}}\n"
spec    
ports   
0   
protocol    "TCP"
port    8000
targetPort  8000
selector    
k8s-app "dashboard-metrics-scraper"
clusterIP   "10.96.0.30"
type    "ClusterIP"
sessionAffinity "None"
status  
loadBalancer    {}
1   
metadata    
name    "kubernetes-dashboard"
namespace   "kubernetes-dashboard"
selfLink    "/api/v1/namespaces/kubernetes-dashboard/services/kubernetes-dashboard"
uid "6b3319a1-fe5f-458a-994e-9ecc8fed4cde"
resourceVersion "984846"
creationTimestamp   "2020-03-09T13:57:26Z"
labels  
k8s-app "kubernetes-dashboard"
annotations 
kubectl.kubernetes.io/last-applied-configuration    "{\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"labels\":{\"k8s-app\":\"kubernetes-dashboard\"},\"name\":\"kubernetes-dashboard\",\"namespace\":\"kubernetes-dashboard\"},\"spec\":{\"ports\":[{\"port\":443,\"targetPort\":8443}],\"selector\":{\"k8s-app\":\"kubernetes-dashboard\"}}}\n"
spec    
ports   
0   
protocol    "TCP"
port    443
targetPort  8443
selector    
k8s-app "kubernetes-dashboard"
clusterIP   "10.96.0.115"
type    "ClusterIP"
sessionAffinity "None"
status  
loadBalancer    {}

but connecting to this site http://10.104.12.1:9999/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/#/login

Error trying to reach service: 'dial tcp 10.36.0.2:8443: i/o timeout'

seems like the service kubernetes-dashboard exposing the pod kubernetes-dashboard-5996555fd8-fhvzq is not accessible.

I view all the related topic #kubernetes-dashboard. seem none of it related to the issue I'm facing. Please help!