已安裝 Hosting Bundle
創建無託管的 應用程序池
結果就是IIS日誌報錯
應用程序池停止，瀏覽頁面顯示503…
報錯信息如下：
Warning：A listener channel for protocol 'http' in worker process '3260' serving application pool 'apsnetcode3' reported a listener channel failure. The data field contains the error number.
Error：Application pool 'apsnetcode3' is being automatically disabled due to a series of failures in the process(es) serving that application pool.
查了半天也找不出原因（開發設備上部署正常）
最後發現 Hosting Bundle 需要依賴 C++ …
Download the Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019. The following updates are the latest supported Visual C++ redistributable packages for Visual Studio 2015, 2017 and 2019. Included is a baseline version of the Universal C Runtime see MSDN for details.
安裝C++後恢復正常：https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads