Automatically log off users when logon time expires
Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options
Determines whether to disconnect users that are connected to the local machine outside of their user account's valid logon hours. This setting affects the Server Message Block (SMB) component of a Windows 2000 server.
When this policy is enabled, it causes client sessions with the SMB server to be forcibly disconnected when the client's logon hours expire.
If this policy is disabled, an established client session is allowed to be maintained after the client's logon hours have expired.
While Automatically log off users when logon time expires (local) affects only the individual machines on which it is applied, this policy affects all machines in the domain.