title: when we run the hello-world image its throws the connection refused error message
body: <p>Am newly started learning the docker concepts and i have installed the docker latest version on my VM as per docker official docs, but when i execute the "sudo docker run hello-world" command am getting the below error message.</p>
  
  <p>Error message:
  sudo docker run hello-world
  Unable to find image 'hello-world:latest' locally
  docker: Error response from daemon: Get <a href="https://registry-1.docker.io/v2/" rel="nofollow noreferrer">https://registry-1.docker.io/v2/</a>: http: error connecting to proxy <a href="http://127.0.0.1:3128/" rel="nofollow noreferrer">http://127.0.0.1:3128/</a>: dial tcp 127.0.0.1:3128: getsockopt: connection refused.
  See 'docker run --help'.</p>
  
  <p>Note: I have modified the docker file on /etc/default/docker and enabled the proxy setting as well.
  Docker file:</p>
  
  <h1>If you need Docker to use an HTTP proxy, it can also be specified here.</h1>
  
  <p>export HTTP_PROXY="http://127.0.0.1:3128/"</p>
  
  <p>please find below output as when i execute the "route" command on my VM.</p>
  
  <p>$route
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  default         10.0.2.2        0.0.0.0         UG    0      0        0 eth0
  10.0.2.0        *               255.255.255.0   U     1      0        0 eth0
  172.17.0.0      *               255.255.0.0     U     0      0        0 docker0</p>
  
  <p>please give your valuable comments on this issue.</p>
  
  <p>Thank you in advance!</p>