Getting 031-529 Login Failed Error when setting up to scan to computer

Hi all, can you help with my query?

I am trying to set up my Dell C1765NF Printer to scan to my iMac.  They are on the same network, the printer is networked using ethernet and the iMac connects wirelessly.

I have created a scan folder called 'Dell' where it is shared and 'Everybody' has read and write permissions.

On the web control panel I have entered:

Server type: SMB

Server Address: the IP of my iMac which I got from Terminal

Share Name: Dell 

Server Path: Left blank as 'Dell' folder sits on my desktop

Server Port Number: 139

Login Name: My iMac account login name is used and the password

Everytime I try to scan I get a Login Failed Error on 031-529.  Does anyone know what might be wrong?