Attaching multiple gateways to istio's ingressgateway

I’ve an existing service exposed via LoadBalancer; which I can access no issues up until this point.

Roughly the routing is : Load Balancer > Gateway > Virtual Service > Service

The config of the first Gateway & VirtualService looks like this -

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: gw1
  namespace: istio-system
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - ns1/*
    port:
      name: http
      number: 80
      protocol: HTTP


apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: vs1
  namespace: ns1
spec:
  gateways:
  - gw1.istio-system.svc.cluster.local
  hosts:
  - '*'
  http:
  - match:
    - uri:
        prefix: /devapi
    route:
    - destination:
        host: devapi-service.ns1.svc.cluster.local
        port:
          number: 8080

Now in a completely different context I would like to deploy a 2nd service and expose via a separate Gateway/VirtualService.

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: gw2
  namespace: istio-system
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - istio-system/*
    port:
      name: http
      number: 80
      protocol: HTTP


apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: vs2
  namespace: istio-system
spec:
  gateways:
  - gw2.istio-system.svc.cluster.local
  hosts:
  - '*'
  http:
  - match:
    - uri:
        prefix: /query
    route:
    - destination:
        host: query-service.istio-system.svc.cluster.local
        port:
          number: 8080

The above end-point is not accessible.

Ignore for a moment why this service is deployed to istio-system namespace. But my question is this - “Is it possible to deploy more than one gateway attaching itself to istio: ingressgateway ?”

Any thoughts on this pls.

@adurai81 this might be caused by giving identical names to the ports on both Gateway resources and deploying them both in the same namespace. See https://github.com/istio/istio/issues/12500