I think Wootah is on the right path here. I had a similar problem that drove me nuts for a while. In general, what I discovered was that the more -o options you give, the better. Also try listing the workgroup/domain name or even the ip address. I.E.
Code:
sudo mount -t smbfs //<ip>/share_name /media/my_share -o username=theuser,password=thepass,iocharset=utf8,file_mode=0777,dir_mode=0777,domain=thedomain,ip=theIPaddress
More options can be found by doing a man on smbmount. These options should work in cifs, too.
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