对我来说，这是流浪者和虚拟盒子之间的兼容性。

我在windows 10上，我所做的就是卸载流浪者和虚拟盒子

然后安装一个旧版本的虚拟盒子，特别是4.3.38版本(也为这个版本安装扩展包)

然后安装最新版本的vagrant(目前1.8.5)

从那以后，它起作用了。

我也有同样的问题。我认为问题可能是SSH密钥(错误的文件定位或其他东西，但我检查了很多次)，但你可能总是在配置部分添加用户名和密码(不使用SSH密钥)和运行gui，所以Vagrantfile中的代码应该看起来或多或少如下:

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.ssh.username = "vagrant"
  config.ssh.password = "vagrant"

   config.vm.provider "virtualbox" do |vb|
     vb.gui = true
   end
end

In my case even if GUI was displayed I got black screen (no errors or possibility to login or anything else) and in console I got the Error: Connection timeout. Retrying... many times. I made sure I had VT-x (virtualization) enabled in BIOS, I checked many combinations of versions of both Virtual Box and Vagrant together and many Vagrant boxes (for some of them I didn't have black screen in GUI but still have connection problems). Finally I've updated VirtualBox and Vagrant again to the last versions and the problem still occurred.

最关键的是在运行vagrantup(使用Vagrantfile中的GUI)后，在VirtualBox中查看图标，如下图所示

虽然我在VirtualPC中没有错误(没有VT-x未启用的警告)，但我的V图标是灰色的，所以这意味着VT-x被禁用。正如我说的，我一直在我的BIOS中启用它。

Finally I realized the problem might by HYPER-V which I also installed and enabled to test sites on older Internet Explorer. I went to Windows Control Panel -> Programs and functions / Software and choose from the menu on left Turn on or Turn off Windows functions (hope you will find those, I use Polish Windows so don't know exact English names). I turned off Hyper-V, restarted PC and after running Virtual Box and vagrant up I finally had no errors, in GUI I have login screen and my V icon stopped to be gray.

我浪费了很多时间来解决这个问题(和许多电脑重启)，所以我希望这可能对任何在Windows上有问题的人有帮助-确保你在控制面板中关闭了Hyper-V。

在我的情况下，给它一个静态IP地址，简单地解决了问题:

Config.vm.network "private_network"， ip: "192.168.50.50"

而不是ctrl-d-ing出虚拟框，因为我习惯做每当我ssh到任何东西，我相信流浪者更喜欢你进入另一个终端，并做一个:

流浪汉瘸腿

让盒子停下来。然后回到VB就没有问题了。

My solution turned out to be none of the above exactly. I'm running Ubuntu 14 as guest inside a Windows 7 host. I had been running this vagrant box fine, but I started it up again after not using it for a couple of months, and it kept coming up with the SSH connection timeout. It turned out that somehow the key pair didn't work - so I copied the Vagrant public key into Ubuntu according to the instructions on this page. But that wasn't all. I then discovered that the private key in my base box was different than the private key here. Putting this private key in as the vagrant_private_key file in C:\Users\your-user.vagrant.d\boxes\vagrant-box-name\nnnnnnnn\virtualbox after placing the public key into Ubuntu fixed the problem.

如果你不想启用GUI，然后不得不禁用它，你也可以从Oracle安装扩展包:

http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html#extpack

然后把这个放在你的Vagrantfile中来启用VRDP:

vb.customize ["modifyvm", :id, "--vrde", "on"]

现在您可以使用RDP按需连接到您的盒子，而不需要运行SSH或一直打开GUI。