当我在Docker中运行`docker run hello-world`时，连接的主机没有响应

Docker（版本0.6）的最新版本已经通过安装包docker docker toolbox安装在笔记本电脑（Windows 10 LTSB）中。 这似乎是正确安装，因为我看到docker的标志，当我启动docker quickstart terminal 。 而当我运行docker run hello-world ，它会返回

 $ docker run hello-world D:\Program Files\Docker Toolbox\docker.exe: An error occurred trying to connect: Post https://192.168.99.100:2376/v1.24/containers/create: dial tcp 192.168.99.100:2376: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.. See 'D:\Program Files\Docker Toolbox\docker.exe run --help'. 

顺便说一下，我通过cisco anyconnect打开VPN。 但是，当我断开vpn并运行hello world ，似乎只是冻结在

 $ docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world c04b14da8d14: Pulling fs layer 

发生了什么？ 你能finddocker或者vpn有什么问题吗？