为什么我的网站即使掉线也能看到? [英] Why can I see my website even though it's down?

问题描述

我想知道是否有人知道这是怎么回事?我的网站已关闭，但是我的互联网连接/路由器上的每台计算机都可以看到它.我已经清除了缓存等内容，但是家里的另一台计算机应该看不到离线的站点.多么奇怪?

I'm wondering if anyone knows how this happens? My website is down, but every computer on my internet connection/router can see it. I've cleared my cache etc, but another computer in the house shouldn't be seeing a site that's offline. How weird?

它是远程托管的，而不是在我的网络或其他任何设备上.

It's hosted remotely, not on my network or anything.

推荐答案

您知道Web服务器的IP地址吗?您是否可以通过端口80直接访问Internet?

Do you know the IP address of your web server? Do you have direct access to the Internet on port 80?

通过执行以下操作来告诉您服务器是否启动或关闭:

Tell if your server is up or down by doing the following

telnet 255.255.255.255 80

其中255.255.255.255是您的Web服务器的IP地址.在Windows上，如果服务器应答，屏幕将变为空白.然后输入

Where 255.255.255.255 is your web server's IP address. On windows the screen will go blank if the server answers. Then type

GET / HTTP/1.0

然后按回车两次.您应该看到默认页面的内容.如果您以虚拟主机身份运行，则可能需要使用HTTP/1.1和Hostname标签.

And hit enter twice. You should see the content of your default page. If your running as a virtual host, you'll probably need to use HTTP/1.1 and the Hostname tag.

GET / HTTP/1.1
Host: www.yourservername.com

在HTTP/1.1之后有一个返回，在主机名之后有两个返回.如果您从Web服务器取回内容(正确的内容)，则肯定不会中断.如果服务器无法连接，则您的Web服务器确实已关闭，并且您的计算机看到的内容可能是以下任何内容:

There is one return after HTTP/1.1 and two returns after your hostname. If you get content (the correct content) back from your web server it is definitely not down. If the server fails to connect then your web server is really down, and the content your computers are seeing could be any of the following:

• 本地页面缓存
• 本地代理服务器
• ISP代理服务器
• 本地ARP中毒攻击将您重定向到镜像您站点的攻击者的本地Web服务器.
• DNS中毒会将您的浏览器定向到镜像您站点的其他Web服务器.

如果您的站点正常运行，但地理位置分散的人们看不到您的站点，则很可能是DNS问题或ISP级别的路由问题.

If your site is up, but geographically separated folks can't see your site, it is most likely a DNS issue or an ISP level routing issue.

OpenDNS的CacheCheck 是检查DNS问题的好工具.至于路由问题，最好的办法是致电您的网络托管公司，以查看他们是否还有其他客户的其他投诉，或者他们当前是否在解决路由问题.

A good tool to check for DNS issues is OpenDNS's CacheCheck. As for the routing issue, the best bet is to call your web hosting company and see if they've had any other complaints from their other customers, or if they are currently working on a routing issue.

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