Docker commands don't work

General
1

[Windows 7]
When i type docker images or docker search for example, it shows me (Classic terminal, admin rights):

Get http://127.0.0.1:2375/v1.20/images/json: dial tcp 127.0.0.1:2375: ConnectEx tcp: Aucune connexion n’a pu être établie car l’ordinateur cible l’a expressément refusée…

  • Are you trying to connect to a TLS-enabled daemon without TLS?
  • Is your docker daemon up and running?

And in Babun via ConEmu with babun-docker :

An error occurred trying to connect: Get https://192.168.99.100:2376/v1.20/images/json: dial tcp 192.168.99.100:2376: >ConnectEx tcp: Une tentative de connexion a échoué car le parti connecté n’a pas répondu convenablement au-delà d’une certaine durée ou une connexion établie a échoué car l’hôte de connexion n’a pas répondu.
– babun-docker: VirtualBox shared folder for drive c was arealdy set
– babun-docker: VirtualBox shared folder for drive g was arealdy set
– babun-docker: Trying to start docker-machine default
Started machines may have new IP addresses. You may need to re-run the docker-machine env command.
– babun-docker: Volumes, creating directory for drive: c
– babun-docker: Volumes, mounting drive: c
– babun-docker: Volumes, creating directory for drive: g
– babun-docker: Volumes, mounting drive: g
– babun-docker: Setting up docker-machine environment

and it hangs…(hangs on babun only).

What can I do to avoid that ?