Since several days now we are plagued with the hundreds of knocks on our UDP port 137 mainly caused by the Opasoft and/or Bugbear, in the meantime additional ports have shown up. I found a solution which works for me to have not any of those portscans at all, which is: Use TDS > Networks > TCP Port Listen > choose port 137 > Listen. After your firewall might ask to allow server or not; in both cases it works the same for me: i don't see packets from that entering my system nor do i get any portscans anymore as long as that function is up, while it immediately starts again when i close that. I'm urgently trying to get straight answers from other users if that solution works for others as well or not at all or if they have other ways to stop them to be able to give this as an advice to other users who even are about Ddossed in several cases by those "attacks" and even lose internet connections! So please for the well-being of the internet community as a whole be so kind to try this trick on your own system and be so kind as to choose the option which works best for you. Thanks a lot for cooperation!