Server Application Unavailable 解決方案

錯誤提示：

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.

解決辦法：

給應用程式目錄添加IIS_WPG

開啟我的電腦--［工具］--［檔案夾選項］--［查看］
這時候看到［進階設定］了吧，找到［使用簡單檔案分享權限設定（推薦）］，把它前面的勾去掉，然後再開啟檔案夾屬性，看看，多了個安全選項卡了吧，添加IIS_WPG許可權就行了。