ModuleIIS Web Core NotificationBeginRequest HandlerNot yet determined Error Code0x80070021 Config ErrorThis configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".
appcmd解决这个问题的command line: appcmd.exe unlock config "web site name" -section:system.webServer/Handler -commitPath:apphost
AppCmd.exe is located in the %systemroot%\system32\inetsrv\ directory. Because it is not path of the PATH automatically, you need to use the full path to the executable when executing commands like in "%systemroot%\system32\inetsrv\AppCmd.exe list sites". Alternatively, you can manually add the inetsrv directory to the path on your machine so that you can access AppCmd.exe directly from any location.