Dear all,
I finally managed to make this work.
The problem is shown in the next snapshot:
When trying to authenticate with SMB credentials I was using the value from the Full Name column as the username, when I should be using the one from the Name column.
The reason of this misunderstanding is that the value in the Full name column is the one shown in the Windows login screen as “your user name”. See the following image (where Jack is the username):
Additionally, I would like to point out that the openvas-smb package is not required for Windows authentication.
While reading the threads from other users regarding this topic I have realized this issue might not be clearly explained in the docs, in my humble opinion.
Kind regards.