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。

我也遇到过同样的问题。我通过在BIOS设置中启用虚拟化来解决这个问题。

VMware提供商的用户还有一个可能的解决方案: 对我来说，在同一台主机上删除并行安装的VirtualBox后，这个问题得到了解决。VMware和VirtualBox之间的网络接口明显冲突

SSH连接在初始启动时超时可能与多种原因有关，例如:

check whether virtualization is enabled in BIOS (as per comment), system awaits for user interaction (e.g. share partition is not ready), mismatch of your private key (check the config via vagrant ssh-config), the booting process takes much longer time (try increasing config.vm.boot_timeout), it's booting from the wrong drive (e.g. from the installer ISO), VM firewall misconfiguration (e.g. iptables configuration), local firewall rules, port conflict or conflict with a VPN software, sshd misconfiguration.

要调试问题，请运行——debug选项或如下:

VAGRANT_LOG=debug vagrant up

如果没有什么明显的，那么尝试从另一个终端连接到它，通过vagrant ssh或通过:

vagrant ssh-config > vagrant-ssh; ssh -F vagrant-ssh default

如果SSH仍然失败，尝试使用GUI(例如config. exe)运行它。GUI = true)。

如果不是，检查正在运行的进程(例如:vagrant ssh -c ' pstrree -a')或验证您的sshd_config。

如果它是一次性的虚拟机，你总是可以尝试破坏它，并重新启动它。

你也应该考虑升级你的Vagrant和Virtualbox。

有关详细信息，请检查调试和故障排除页面。

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.

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。