title: `upstream connect error or disconnect/reset before headers` when using istio-ingress-gateway
body: <p>I was testing my ingress and I deleted the following two gateways for testing purpose.</p>
  
  <pre><code>kubectl delete gateway istio-autogenerated-k8s-ingress -n istio-system
  kubectl delete gateway istio-system-gateway -n istio-system
  </code></pre>
  
  <p>Since, then I am having this error <code>upstream connect error or disconnect/reset before headers</code> for any url I access through the <code>ingress-gateway</code>.</p>
  
  <p>Is it related and if so, how can I set them up again?
  If not, how can I debug this?</p>
  
  <p>I have tried to reinstall istio following this <a href="https://cloud.google.com/kubernetes-engine/docs/tutorials/installing-istio" rel="nofollow noreferrer">https://cloud.google.com/kubernetes-engine/docs/tutorials/installing-istio</a>.
  However, it did not work nor did the two gateways got recreatted.</p>