问题描述
我正在通过railstutorial.org学习Ruby on Rails.从第1章开始，我已经进行了所有设置并运行正常.但是，突然之间，我的下一个应用程序出现了问题.
I am learning Ruby on Rails with railstutorial.orgI had set everything up and working fine from Chapter 1. However, all of a sudden my next app has an issue.
我运行"rails服务器"
I run "rails server"
=> Booting WEBrick
=> Rails 3.2.9 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2012-11-15 00:45:08] INFO WEBrick 1.3.1
[2012-11-15 00:45:08] INFO ruby 1.9.3 (2012-11-10) [x86_64-linux]
[2012-11-15 00:45:08] INFO WEBrick::HTTPServer#start: pid=2752 port=3000
似乎工作正常，就像我以前的应用程序一样.
Seems to be working fine, just like with my previous app.
但是，我尝试在各种浏览器上连接到localhost:3000，0.0.0.0:3000，127.0.0.1:3000，但它们都无法建立与服务器的连接.
However, I try connecting to localhost:3000 , 0.0.0.0:3000 , 127.0.0.1:3000 on various browsers and they all cannot establish a connection to the server.
一些注意事项:
-我刚刚能够连接到本地主机-好像突然突然停止工作了.
-I was able to connect to localhost just a while ago--it just seems like it suddenly stopped working out of the blue.
-我的第一个应用程序运行正常，但现在也不适用于我的第一个应用程序.
-My first app was working perfectly fine, but now it doesn't work for my first app either.
-我没有防火墙阻止该端口，并且我的主机文件不是问题.
-I don't have firewalls blocking the port, and my hosts file is not the problem.
-我在Ubuntu 12.10上
-I am on Ubuntu 12.10
我几乎总是通过搜索找到解决方案，但是这次没有..所以我需要一些帮助.我感到非常沮丧，因为我觉得这是一个很简单的问题，我花了太长时间才被困在上面.
I almost always find solutions via search, but not this time.. so I need some help please. It's very frustrating as I feel like it's a simple problem that I spent way too long being stuck on.
谢谢.
推荐答案
，带有rails 4.2.0，默认情况下，服务器绑定到localhost，而不是0.0.0.0.在虚拟盒子中使用滑轨时，从主机访问服务器时，绑定地址必须为0.0.0.0
with rails 4.2.0, the server binds to localhost by default, instead of 0.0.0.0. When working with a rails in a virtual box, accessing the server from the host computer, the binding address needs to be 0.0.0.0
使用-b0.0.0.0启动Rails服务器，以便可以从主机/浏览器访问Rails服务器.
Start rails server with -b0.0.0.0 to make the rails server accessible from the host computer/browser.
http://guides.rubyonrails.org/4_2_release_notes.html#default-host -for-rails-server https://github.com/samuelkadolph/unicorn-rails/issues/12#issuecomment-60875268
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