KeepConn doesn't work

Hi,

When connecting from Win2003 Terminal Services session to Win2003 file
server: opening shared directory via UNC notation - the connection is closed
within 10 seconds of closing Windows Explorer window. KeepConn (in Registry)
dosn't change this behavior.

Details:

AD domain (MYDOM), server A (Win2003, MYDOM domain member) with Terminal
Services installed, server B (Win2003, MYDOM domain member) - fileserver.
User U (MYDOM domain user) uses Terminal Services on server A.
The user (U) types \\server-B-ip-addr\some-share-name in Run menu. New
Windows Explorer window opens: shows directory contents in shared folder on
B. On A, "netstat -n" - shows new TCP connection (between A and B) via
remote port 445.
Now the user closes the above Windows Explorer window. After ~10 seconds,
"netstat -n" on A shows the above TCP connection was closed (TIME-WAIT
state). Changing KeepConn Registry value on A doesn't change this behavior,
TCP connection is still closed in ~10 seconds.

Is there a way to prevent disconnecting SMB session (between A and B) for
longer period of time: like 10 minutes?

MSDN article http://support.microsoft.com/kb/903237 covers similar scenario,
but on Win2000. The article says, there's hotfix available (for Win2000) to
resolve this issue. Is there similar hotfix available for Win2003?

Thanks,
Boris