Hi bel1073,
I understand that you are having a problem with the scanner not being found. Before you try to setup a Standart TCP IP port (dummy port). Could you please try the steps in this document for A 'Connection Error' or 'No Computer Detected' Error Message Displays during Scanning. There are steps for getting the scanner to work through the firewalls on your computer.
I hope this helps, let me know.
Thank you,