title: Not able to push docker image into untrusted registry
body: <p>I have configured Harbor docker registry in GCP compute engine (hostname : harbor ) , as I have not installed any certificate I am able to access the registry through http (port 80) &amp; from client end (within same VPC of harbor registry compute engine) I have configured docker insecure registry as below </p>
  
  <pre><code>[root@client docker]# cat /etc/docker/daemon.json
  {
  "insecure-registries" : [
      "harbor:80",
      "&lt;external-ip&gt;:80",
      "10.128.0.20:80"
    ],
    "debug" : true,
    "experimental" : true
  }
  </code></pre>
  
  <p>but while I am trying to login into the docker registry I am getting bellow error (it's automatically hitting my registry in port 443 not 80)</p>
  
  <pre><code>[root@client docker]# docker login -u "####" -p "####" harbor 
  
  Error response from daemon: Get https://harbor/v1/users/: dial tcp 10.128.0.20:443: connect: connection refused
  </code></pre>
  
  <p>Could you please help me resolve the issue </p>