windows7安装laravel homestead后,卡在SSH auth method: private key

<code class="bash">$ homestead up
Bringing machine 'default' up with 'virtualbox' provider...
==&gt; default: Importing base box 'laravel/homestead'...
==&gt; default: Matching MAC address for NAT networking...
==&gt; default: Setting the name of the VM: homestead
==&gt; default: Clearing any previously set network interfaces...
==&gt; default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
    default: Adapter 2: hostonly
==&gt; default: Forwarding ports...
    default: 80 (guest) =&gt; 8000 (host) (adapter 1)
    default: 443 (guest) =&gt; 44300 (host) (adapter 1)
    default: 3306 (guest) =&gt; 33060 (host) (adapter 1)
    default: 5432 (guest) =&gt; 54320 (host) (adapter 1)
    default: 22 (guest) =&gt; 2222 (host) (adapter 1)
==&gt; default: Running 'pre-boot' VM customizations...
==&gt; default: Booting VM...
==&gt; default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2222
    default: SSH username: vagrant
    default: SSH auth method: private key</code>

<code class="bash">$ homestead halt
==&gt; default: Attempting graceful shutdown of VM...
    default: Guest communication could not be established! This is usually because
    default: SSH is not running, the authentication information was changed,
    default: or some other networking issue. Vagrant will force halt, if
    default: capable.
==&gt; default: Forcing shutdown of VM...
</code>

<code class="bash">$ homestead up
Bringing machine 'default' up with 'virtualbox' provider...
==&gt; default: Importing base box 'laravel/homestead'...
==&gt; default: Matching MAC address for NAT networking...
==&gt; default: Setting the name of the VM: homestead
==&gt; default: Clearing any previously set network interfaces...
==&gt; default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
    default: Adapter 2: hostonly
==&gt; default: Forwarding ports...
    default: 80 (guest) =&gt; 8000 (host) (adapter 1)
    default: 443 (guest) =&gt; 44300 (host) (adapter 1)
    default: 3306 (guest) =&gt; 33060 (host) (adapter 1)
    default: 5432 (guest) =&gt; 54320 (host) (adapter 1)
    default: 22 (guest) =&gt; 2222 (host) (adapter 1)
==&gt; default: Running 'pre-boot' VM customizations...
==&gt; default: Booting VM...
==&gt; default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2222
    default: SSH username: vagrant
    default: SSH auth method: private key</code>

<code class="bash">$ homestead halt
==&gt; default: Attempting graceful shutdown of VM...
    default: Guest communication could not be established! This is usually because
    default: SSH is not running, the authentication information was changed,
    default: or some other networking issue. Vagrant will force halt, if
    default: capable.
==&gt; default: Forcing shutdown of VM...
</code>