今日需要在Windows 2008上面修改一個schedule task，將Security options裏面的Run only when user is logged on改爲Run whether user is logged on or not, 保存密碼的時候收到一個錯誤：
specified logon session does not exist. it may already have been terminated
新建task也不行。感覺和組策略有關係，上網查找，果然和Computer Configuration - Windows Settings - Security Settings - Local Policies - Security Options下面的Network access: Do not allow storage of credentials or .NET Passports for network authentication"有關，將其disable，問題解決。
