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網站訪問提示：
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.

查看Event Viewer看到的錯誤為：

Event Type: Error
Event Source: ASP.NET 2.0.50727.0
Event Category: None
Event ID: 1088
Description:
Failed to execute request because the App-Domain could not be created. Error: 0x80070005 Access is denied.

Event Type: Error
Event Source: ASP.NET 2.0.50727.0
Event Category: None
Event ID: 1334
Description:
Failed to initialize the AppDomain:/LM/W3SVC/1937156701/Root

Exception: System.IO.FileLoadException

Message: Could not load file or assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Access is denied.

原因：

1、權限引起的,由于此錯誤出現在虛擬主機,在新建的應用程序使用的是默認的應用程序池,用的是默認賬號運行的,而此文件夾沒有此權限.更改程序使用的應用程序池或添加權限.

2、Framework1和2混用。

cmd
net stop s3svc
cd C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727
aspnet_regiis -ua
aspnet_regiis -i
net start w3svc
先給所在的目錄加加aspnet iiswpg

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