尝试将这些帐户的读/写访问权限提供给Web应用程序的根文件夹和所有文件/子目录：

Try giving read/write access to these accounts to the root folder of your Web application and all files/subs within:

网络，网络服务，当然还有IIS_IUSRS

NETWORK, NETWORK SERVICE, and of course IIS_IUSRS