Docker : on Mac, Failed to connect boot2docker : Connection refused

Link: http://stackoverflow.com/a/23021012

$ VBoxManage modifyvm "boot2docker-vm" --natpf1 "containerssh,tcp,,42222,,42222"
$ ./boot2docker start
[2014-04-11 12:07:35] Starting boot2docker-vm...
[2014-04-11 12:07:55] Started.
$ docker run -d -p 42222:22 dhrp/sshd
Unable to find image 'dhrp/sshd' (tag: latest) locally
Pulling repository dhrp/sshd
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26e4b94e5a13b4bb924ef57548bb17ba03444ca003128092b5fbe344110f2e4c
$ docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                   NAMES
26e4b94e5a13        dhrp/sshd:latest    /usr/sbin/sshd -D      6 seconds ago       Up 3 seconds        0.0.0.0:42222->22/tcp   loving_einstein     
$ ssh root@localhost -p 42222

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