I had faced a problem with mounting Win Srv 2003 shares to linux box (particularly FC4). The usual way for me to mount was: mount -t smbfs -o username=user,password=pass //host/share /mount/point
This time it was giving me an error: cli_negprot: SMB signing is mandatory and we have disabled it.
After some searches in Google I found out about mount.cifs which solves all the problems. From now on, whenever I need to mount a share from Win Srv 2003 I use a command mount -t cifs -o user=username,pass=password //host/share /mount/point or an entry in /etc/fstab: //host/share /mount/point cifs auto,user=username,pass=password,rw 0 0