Dashboard: Can not access to the dashboard, getsockopt: connection refused

[StefanSa]

Sorry, i am completely new in kubernetes.

Issue details
I have kubernetes-dashboard running, but i can not connect with the public IP from the master.
http://172.17.35.99:8080/ui

I get this error message:
Error: 'dial tcp 172.30.46.3:9090: getsockopt: connection refused' Trying to reach: 'http://172.30.46.3:9090/

What do i need to do to access the dashboard?

Environment

[root@k-master kubernetes]# kubectl describe service kubernetes-dashboard --namespace=kube-system
Name:           kubernetes-dashboard
Namespace:      kube-system
Labels:         k8s-app=kubernetes-dashboard
            kubernetes.io/cluster-service=true
Selector:       k8s-app=kubernetes-dashboard
Type:           ClusterIP
IP:         10.254.221.65
Port:           <unset> 80/TCP
Endpoints:      172.30.46.3:9090
Session Affinity:   None

Why does the connection fail?

root@k-master kubernetes]# curl 172.30.46.3:9090
curl: (7) Failed connect to 172.30.46.3:9090; connection refused

[root@k-master kubernetes]# kubectl -n kube-system logs kubernetes-dashboard-3795753315-xr1zf
Using HTTP port: 9090
Using apiserver-host location: 172.17.35.99:8080
Creating API server client for 172.17.35.99:8080
Successful initial request to the apiserver, version: v1.5.2
Creating in-cluster Heapster client

Dashboard version: 1.5.0
Kubernetes version: 1.5.2
Operating system: centos 7.3

[StefanSa]

OK, i found the problem.
on the master missing flannel, after install flanneld everything was OK