我通过在/etc/fstab中添加一个新条目来测试我的vagrant VM中挂载的文件夹。后来我注销了，跑了个流浪汉，但当我跑了个流浪汉，我得到:

SSH auth method: private key
Warning: Remote connection disconnect. Retrying...

I read all these posts and tried all the ones that seemed relevant for my case (except for vagrant destroy, which would have certainly fixed my problem, but was a last resort in my case). The post by @Kiee gave me the idea to try to boot my VM directly from the VirtualBox GUI. During the boot process the VM halted itself and was asking me if I wanted to skip mounting the test folder that I had added earlier to /etc/fstab. (That's why vagrant couldn't boot the VM.) After answering 'NO' the VM booted no problem. I logged in, removed the naughty line from my fstab, and shutdown the VM.

在那之后，流浪汉就能很好地踢足球了。

外卖吗?如果突然间vagrant无法引导回您的VM，请尝试直接从提供商引导(在我的情况下是VirtualBox)。您的引导可能挂起了与SSH完全无关的东西。

我解决的方法是，在Windows上键入两次“cmd”(或“ctrl+C”)，然后退出连接失败的屏幕。

然后，我可以通过SSH (vagrant SSH)连接，并自己查看错误。

在我的例子中，这是一个输入错误的路径。

对我来说有用的是从BIOS允许64位操作系统(Ubuntu 13.10)上的64位虚拟化。

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.

我找到的解决方案是检查连接到NAT的适配器1中的电缆连接选项。我真的不知道，这是我的第四个流浪者盒子，但这是唯一一个没有选中电缆连接选项的盒子，检查它后，它工作了。

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。