Vagrant/VirtualBox未连接（“连接被拒绝。正在重试…”）

我使用的是Vagrant 1.7.2和VirtualBox 4.3.28，基本上是Windows 8上最新的版本。我在通过vagrant up进入虚拟机时遇到问题

以下是我得到的信息：

$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Checking if box 'hashicorp/precise32' is up to date...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
==> default: Forwarding ports...
    default: 22 => 2222 (adapter 1)
==> default: Booting VM...
==> 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
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...
    default: Warning: Connection refused. Retrying...

我有一种感觉，这与我的私钥有关，但我不知道如何解决它

这是我的Vagrant文件，基本上是默认文件：

Vagrant.configure(2) do |config|
    config.vm.box = "hashicorp/precise32"
end

---

可能与此无关，但您是否为特定版本的VirtualBox安装了VM VirtualBox扩展包

通常，vagrant使用自定义密钥，该密钥存储在Linux上的$HOME/.vagrant.d/unsecure_private_密钥中。。我不确定它在Windows上的存储位置，但我希望它也位于主文件夹中。您可以搜索该文件吗？请检查此项：您的Vagrant文件可能与共享的副本有关：