title: docker-proxy - Error starting userland proxy while trying to bind on 443
body: <p>I'm trying to install discourse with docker in an Ubuntu 16.04 LTS with Apache listening to port 80 and 443.</p>
  
  <p><a href="https://i.stack.imgur.com/iyPoG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iyPoG.jpg" alt="enter image description here"></a></p>
  
  <p>When I try to lunch the app I get the following error:</p>
  
  <blockquote>
    <p>starting up existing container
    + /usr/bin/docker start app Error response from daemon: driver failed programming external connectivity on endpoint app
    (dade361e77fbf29f4d9667febe57a06f168f916148e10cc1365093d8f97026bb):
    <strong>Error starting userland proxy: listen tcp 0.0.0.0:443</strong>: listen: address
    already in use Error: failed to start containers: app</p>
  </blockquote>
  
  <p>For what I'v found docker-proxy is the one that is trying to bind on 443.</p>
  
  <p><a href="https://i.stack.imgur.com/EEQdW.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EEQdW.jpg" alt="netstat -tulpn | grep 443"></a></p>
  
  <p>How can I solve this?</p>
  
  <p>Some details...</p>
  
  <pre><code>docker version
  Client:
   Version:      1.11.2
   API version:  1.23
   Go version:   go1.5.4
   Git commit:   b9f10c9
   Built:        Wed Jun  1 22:00:43 2016
   OS/Arch:      linux/amd64
  
  Server:
   Version:      1.11.2
   API version:  1.23
   Go version:   go1.5.4
   Git commit:   b9f10c9
   Built:        Wed Jun  1 22:00:43 2016
   OS/Arch:      linux/amd64
  
  
  docker info
  Containers: 1
   Running: 0
   Paused: 0
   Stopped: 1
  Images: 4
  Server Version: 1.11.2
  Storage Driver: aufs
   Root Dir: /var/lib/docker/aufs
   Backing Filesystem: extfs
   Dirs: 25
   Dirperm1 Supported: true
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins:
   Volume: local
   Network: null host bridge
  Kernel Version: 4.4.0-28-generic
  Operating System: Ubuntu 16.04 LTS
  OSType: linux
  Architecture: x86_64
  CPUs: 4
  Total Memory: 31.39 GiB
  Name: sd-12345
  ID: 6OLH:SAG5:VWTW:BL7U:6QYH:4BBS:QHBN:37MY:DLXA:W64E:4EVZ:WBAK
  Docker Root Dir: /var/lib/docker
  Debug mode (client): false
  Debug mode (server): false
  Registry: https://index.docker.io/v1/
  WARNING: No swap limit support
  </code></pre>