我在使用x64盒子(chef/ubuntu-14.04)时也遇到了同样的问题。

我更改为x32，它工作(hashicorp/precise32)。

当我杀死腻子过程时，我解决了这个问题。因为我同时运行了git-ssh和putty。他们似乎在争夺ssh访问权。一个就够了。

如果你在Windows 8或Windows 10上工作，这对我来说很管用:

更改BIOS设置以允许64位虚拟化。 以下是如何做到的: 使用高级启动重启PC(进入高级启动-'立即重启'-'故障排除'-'高级选项'-' UEFI固件设置'-'重新启动') 在BIOS窗口内-转到“高级”菜单/选项卡-启用“英特尔虚拟技术” 保存并退出。

我在《Vagrant 1.6.5》和《Virtual Box 4.3.16》中也遇到了同样的问题。 在https://github.com/mitchellh/vagrant/issues/4470上描述的解决方案对我来说很好，我只需要删除VirtualBox 4.3.16并安装旧版本4.3.12。

我在一台Windows 8.1的机器上遇到了同样的问题。连接超时和启用gui根本没有用，屏幕是黑色的。在我的情况下，修复是禁用“超V”

引用自Vagrant文档https://docs.vagrantup.com/v2/hyperv/index.html

警告:启用Hyper-V将导致VirtualBox、VMware和任何其他虚拟化技术不再工作。请参阅这篇博客文章https://www.hanselman.com/blog/SwitchEasilyBetweenVirtualBoxAndHyperVWithABCDEditBootEntryInWindows81.aspx，如果有需要其他管理程序的时候，可以简单地创建一个引导条目来启动没有启用Hyper-V的Windows。

需要反复检查的一件事是，您的计算机BIOS中是否启用了硬件虚拟化。

我的问题是相同的超时字符串，但我只能在GUI中看到黑屏。

我刚刚安装的一台笔记本电脑一直显示同样的问题。经过几个小时的搜索，我终于找到了一个提示，看看BIOS是否启用了硬件虚拟化。

以下是我找到的帖子内容:

我发现仍然有一些用户遇到了这个问题。因此，我将尝试在下面总结一些可能的解决SSH超时问题的方法:

Make sure your firewall or antivirus is not blocking the program (which I doubt will happen often) Give your vagrant machine some time for timeouts to happen. If you dont have a very fast PC / Mac, the VM will take while to boot into an SSH ready state, so timeouts will happen. Therefore, first try to let vagrant timeout COMPLETELY before concluding that there is a fault. If vagrant times out completely then increase the timeout limit in the vagrant file to a few min and try again. If that still doesnt work, then try to clean boot your vagrant machine through the VirtualBox interface and enable the GUI of the machine beforehand. If the GUI doesn't show anything happening (ie. just blackscreen, no text) while it is booting, then your vagrant machine has got problems. Destroy the entire machine through the VB interface and reinstall. Delete the ubuntu image files in the Vagrant Images folder in the user folder and redownload and install. Do you even have an intel processor that supports 64bit hardware virtualisation? Google it. If you do, make sure there is no setting in your Bios disabling this feature. Disable hyper-v feature if you are running windows 7 or 8. Google how to disable. Make sure you are running through an SSH enabled client. Use Git bash. Download: http://git-scm.com/downloads Install a 32bit version of ubuntu like trusty32 or precise32. Just change the version in the vagrant file and reinstall vagrant in new directory. Make sure you are using the latest vagrant and virtualbox versions. Last resorts: Format your computer, reinstall windows and buy an intel core isomething processor.

希望这能有所帮助。