sbfs 4gb file limit

[Samba List]

Hi,
 I was using smbfs on one of our Freebsd servers to mount a 800 GB
raid of a  win2k server with NTFS partition. Mounting seems to be great,
but when I try to copy a 18GB file from the freebsd server to the windows
server, strangely after 4GB it gives time out. Is there any fix for this.

The command I am using
-----------------------------------
# mount_smbfs //BACKUP_SHARE_USER at terabyte1/home5 /home5
terabyte1 is my win2k server with netbios enabled.

Uname output on my unix server
---------------------------------------------
FreeBSD backupbrain 4.6-RELEASE FreeBSD 4.6-RELEASE #0: Tue Jun 11
06:14:12 GMT 2002
murray at builder.freebsdmall.com:/usr/src/sys/compile/GENERIC  i386

 Is any patch available to fix this problem.

Regards
SSR