[CentOS] Permission denied using mount.cifs

I'm having a strange problem mounting a share from a Windows 2003 server using cifs:

mount.cifs //osirus.ficticious.org/inetpub /inetpub -ouser=transfer,pass=dkfhjdjskd

It comes back immediately with:

mount error 13 = Permission denied Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)

However, the command below works. (abeit with about a 15 second wait before it comes back):

mount.smbfs //osirus.ficticious.org/inetpub /inetpub -ousername=transfer,password=dkfhjdjskd

Info from smbclient -L:

OS=[Windows Server 2003 3790 Service Pack 1] Server=[Windows Server 2003 5.2]

Anyone else familiar with this problem?

Thanks, Steve