Having already set up network scanning with little fuss on my Windows machine, I was expecting a simple task on Mac OS, but nooooo.
The shared folder method over Samba fails with a login error. Some googling suggests that it’s due to a change in the port number from NetBIOS (139) to TCP/IP (445). Naturally I couldn’t find an easy way to change that on the Mac.
Neither does the address book on the printer’s configuration page allow port 445. Only 139 and a range of 4 digit numbers are allowed.
Thus the alternative is FTP. To enable that, it is necessary to open a Terminal window and use the following command.
sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist
That enables FTP with authentication. Logging in with an FTP client with a user account will bring you to the user’s home folder. I created a subfolder there to keep scan output and configured that through the printer’s web interface.
Now it works 
