您是否在 IIS7 集成模式下运行?

Are you running in IIS7 integrated mode?

IIS7 的经典模式不会自动将无扩展名的 URL 映射到 ASP.NET(很像 IIS6).

Classic mode of IIS7 does not automatically map extensionless URLs to ASP.NET (much like IIS6).

还要确保您的 Web.config 标签配置正确.

Also make sure your Web.config <system.webServer> tag is configured correctly.