Thank you for welcome and reply. I see where to do that in O/E but am wondering if that would affect my Firetrust B9 set-up if I change the port to 120. This program changes zipped files and also changes the name of new unidentified files and works on 110, so am a bit loathe to change it. It didn’t interfere with Norton, nor did it with AVG so I can’t understand this at all. Could you please explain what “Let avast at 110” means please.