I had some difficulty making my Linux box mount shares from a Windows 2003 Server share as it was giving me an error message.
The command I was trying to use was:
mount -t smbfs -o user=username //server/share /mnt
This caused an error of:
cli_negprot: SMB signing is mandatory and we have disabled it.
15137: protocol negotiation failed
SMB connection failed
The command I got to work was:
mount -t cifs -o user=username //server/share /mnt