I guess this isn't working because you're using the external nic card. But normally, with an internal nic, what you get in the device tree is a "File Server", which represents the PC itself that shares the files, and underneath that another device of the template "Generic Windows Share" for each share on the file server that is mounted. This "Share" (not the server) is what's actually mounted. If you leave the password blank for the share, it will try the password for the parent device (the server), as well as no password. When it detects shares automatically with the scanner, this is the device structure as I recall.