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The issue was due to port 9004 not being forwarded through Oracle VM VirtualBox (20170607_OracleVmBox-PortForwarding.png attached). VirtualBox is part of Docker Toolbox, which is required for Docker on Windows 7.
I'm getting the same message, but my server is on a Windows 2012 R2 VM. Any hints on that would be appreciated. So far, I haven't been able to make it work.