按以下方法查看下，应该就可以解决问题了
安装了IIS，打开http://127.0.0.1弹出要你输入用户名和密码对话框的解决方法，大致有以下几个原因，备查阅。
本文系转载：http://hi.baidu.com/love1mj/blog/item/089b0355200c13c0b745aea1.html
原因很多，请尝试以下操作：
1、查看网站属性——文档
看看启用默认文档中是否存在：index.asp index.htm index.html (最好全都有，没有可添加)
2、查看网站属性——主目录
A、本地路径是否指定正确
B、是否勾选“脚本资源访问”？
C、是否勾选“读取”？
D、执行权限：纯脚本
3、查看网站属性——目录安全性——编辑
A、是否勾选“匿名访问”？
B、用户名：IUSR_您的计算机名（不对，就点浏览选择）
C、密码不用改，勾选“允许IIS控制密码”就可以了
D、其它不用选
4、查看网站属性——网站
A、IP地址：全部未分配 或者 选择一个
B、TCP端口：80 （最好不要改，改了访问方法就不一）
5、打开控制面板——管理工具——计算机管理——本地用户和组——用户
A、看看“IUSR_您的计算机名”此用户有没有启动，必须启动（说明：有红色的×表示没有启动）
B、看看“IWAM_您的计算机名”此用户有没有启动，必须启动（说明：有红色的×表示没有启动）
C、在“IWAM_您的计算机名”该用户上按右键——设置密码（密码要记住，后面还需要用上该密码）
6、打开控制面板——管理工具——组件服务——组件服务——计算机——我的电脑——COM+应用程序
A、在“IIS Out-Of-Process Pooled Applications”上按右键选择‘属性’——选择‘标识’，指定用户：IWAM_您计算机名（说明：可以点浏览查找）；输入密码，密码上面步骤的 密码。再次启动该服务，启动后它会动。
B、在“IIS In-Process Applications”上按右键选择‘属性’——选择‘安全性’，将‘启用身份验证’勾去掉
C、
在“IIS Utilities”上按右键选择‘属性’——选择‘安全性’，将‘启用身份验证’勾去掉。
最后，就是测试了.
这个很实用，记得以前弄的时候经常出现此状况，哎，好久没用iis了
@zylew
呵呵，今天重装IIS出现这个问题，所以记录下~~
。。。偶大部分时间用apache，呵呵。
@火星人
PHPer？哈哈，你用ubuntu吗？
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