HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod https://social.technet.microsoft.com/Forums/windowsserver/zh-CN/7154e42b-cab3-4b90-847c-528f33807b2c/30001201102780926377368283124326700387542548026435263812115322?forum=WinServerPreviewZHCN