如果环境为Windows Server 2003 服务器。
出现错误信息如下：
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：
一般原因就是你的网站使用的.net freamWork 选择的“应用程序框架”版本和IIS root设置的版本不一致导致的。请将网站的“应用程序池”与IIS 设置的框架版本调为一样。
如果环境为Win7 IIS7.0 环境
Service Unavailable
HTTP Error 503. The service is unavailable.
解决办法：
修改应用程序此为：Classic.NetApp
