IIS 7 授予使用者權限

我收到以下錯誤：

ASP.NET is not authorized to access the requested resource. Consider granting access 
rights to the resource to the ASP.NET request identity. ASP.NET has a base process 
identity (typically {MACHINE}\ASPNET on IIS 5 or Network Service on IIS 6) that is used   
if the application is not impersonating. If the application is impersonating via 
<identity impersonate="true"/>, the identity will be the anonymous user (typically 
IUSR_MACHINENAME) orthe authenticated request user. 

我讀過 IIS 7 中沒有 ASPNET 使用者。我還添加了

$$ Machine name $$\IIS_IUSRS 但仍然得到錯誤。我需要添加哪個使用者？

它可能是網路服務​​​​

引用自：https://serverfault.com/questions/410781