IS 无法访问请求的页面，因为该页的相关配置数据无效。
配置错误 This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".
处理办法
打开控制面板-添加或者关闭功能-找到IIS 打开图中的功能。