I deployed GKE 1.6.6 and ran a Service with a Cluster IP (in the kube-system 
namespace).

The hosted Kubernetes controller manager on GKE is unable to reach our service 
over the cluster IP. All minions on GKE can reach the service but the hosted 
controller manager cannot.

This behavior is different from what's seen on other 1.6.6 installations like 
kubeadm where the kubernetes controller manager is able to reach the same 
service.

Details on the Service:
======================

The service being deployed is a Portworx volume plugin service 
(https://docs.portworx.com/scheduler/kubernetes/install.html#install) with 
following spec. I'm not including the Pod definitions for sake of brevity (the 
issue here is the service itself is not reachable).

kind: Service
apiVersion: v1
metadata:
  name: portworx-service
  namespace: kube-system
spec:
  selector:
    name: portworx
  ports:
    - protocol: TCP
      port: 9001
      targetPort: 9001

This service is used by the native Portworx volume plugin which is in the 
kubernetes code base and runs within the controller manager.

Would appreciate any help on what I'm missing and what should be the expected 
behavior.

Thanks!

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