You would need to setup a manual type of log on/log off network setting or something that will bump that connection after a select period of time. It would have to be something like what you see when you get "timed out" when logged onto a web page after a lengthy period of inactivity. An explaination of what the "timed out" error is can be read at
http://support.microsoft.com/kb/q181050/
The only thing that I found on this idea applies to 2000 Pro and the need for an auto disconnect on a network. This may give you a better idea.
[FONT=Arial, Helvetica, sans-serif][SIZE=-1]
Change disconnect timeout for network shares[/SIZE][/FONT] [FONT=Arial, Helvetica, sans-serif][SIZE=-1]You might have noticed that even when you are connected to the network and logged on, some or all of your mapped resources show a red X beside the icon, indicating they are disconnected. This occurs because Windows NT and Windows 2000 both use a default resource disconnect time of 15 minutes. This automatic disconnect enables the server to recover server resources from idle connections. You can reconnect to the share fairly quickly by simply double-clicking the icon.
This automatic disconnect behavior applies to Windows 2000 Professional systems that share their resources as well as Windows 2000 Server systems. On either type of system you can view the current server settings, including the automatic disconnect period, using the NET command. Open a command console and type the following command to view your current settings:
NET CONFIG SERVER
The Idle Session Time value indicates the automatic disconnect period. To change the value, use the NET command again, as follows:
NET CONFIG SERVER /AUTODISCONNECT

time)
In place of (time), specify the number of minutes you want Windows 2000 to use for the idle disconnect timeout. Note that this value sets the amount of time the computer will allow idle connections to its resources before closing them, not the length of time you can have resources open on a remote computer. To disable automatic disconnect, set the value to -1[/SIZE][/FONT]
http://www.boyce.us/windows/tipcontent.asp?ID=331