我有一个像dev.something.root.com的子域，我得到一个连接超时。 如果我ping的dev.something.root.com，它返回服务器的IP地址。 如果我在hosts文件中inputIP地址，那么我可以访问该站点。 如果我拿出来 – 我不能再访问该网站。
所以看起来网站似乎没有问题，并且域似乎正在解决正确的IP。
请求不会一路走到IIS我想，因为它不logging任何东西。
我能做些什么来发现问题？
编辑
为什么当我将ip添加到主机文件时会起作用？
那么因为DNSparsing到正确的IP地址，DNS是好的。 现在你只需要在IIS中使用主机头 。
更多信息可以在这里find。
To add a Web site using a host header identifier using the Web Site Creation Wizard 1. In IIS Manager, expand the local computer, right-click the Web Sites directory, point to New, and then click Web Site. 2. Click Next. 3. In the Description box, type the name you have selected for the Web site, and then click Next. 4. In the Enter the IP address to use for this Web site box, click the IP address used by all sites on the server. 5. In the TCP port this Web site should use box, type the port number used by all sites on the server. 6. In the Host Header for this Web site (Default:None) box, type the host header name to identify the Web site. The host header name must contain the full name of the site, for example, dev.something.root.com. 7. If SSL encryption is not enabled on the server, the SSL port box does not appear. If SSL encryption is enabled on the server, type the SSL port number, and then click Next. Note that you cannot use host headers with SSL encryption. 8. In the Path box, type or browse to the path of your Web site home directory. 9. To create a secured or private Web site, clear the Allow anonymous access to this Web site check box, and click Next. (Web sites are configured for anonymous access by default.) 10. In the Web Site Access Permissions box, set the permissions for the home directory. 11. Click Next, and then click Finish.