docker version: Client: Version: 1.9.1 API version: 1.21 Go version: go1.4.3 Git commit: a34a1d5 Built: Fri Nov 20 17:56:04 UTC 2015 OS/Arch: darwin/amd64 Cannot connect to the Docker daemon. Is th...

Error attempting heartbeat call to plugin server: connection is shut down · Issue #2773 · docker/machine