IIS 部署后出现的问题之一

Server Application Unavailable

       The web application you are attempting to access on this web server is currently unavailable.  Please hit the "Refresh" button in your web browser to retry your request.

Administrator Note: An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur.

解决办法：将服务中的ASP.NET State Service 启动，并设置为自动启动，重启电脑后即可解决。如果还不行，则右键网站“权限”，给该网站添加Everyone或者Users即可。