Hi All: Yesterday I decided to test the Network > TCP Port Listen > Bind to Port function and set it to listen to Port 137. After noting that port blocking seemed to be working I turned it off and a little later went to check my Zone Alarm (free version) log. To my surprise it seemed to be frozen at the entry for TDS. Normally it records on average about one 'intruder' or hit or ping per minute, most of them from Yahoo BBS, but the hits had just stopped coming. Even after rebooting, and even after reinstalling ZA, it wasn't working. Since I'd been thinking of shifting to Sygate anyway, I uninstalled ZA and installed Sygate. To my relief it seemed to be working, although it wasn't recording anywhere near the number of hits I'm used to getting. A little later I also received an alert from it and, having had enough for one day, shut down the computer. But today, just after turning it back on, a similar alert arrived: 'Somebody is scanning your computer. Your computer's TCP ports: 81, 8888, 3128, 8080 and 80 have been scanned from 126.96.36.199.' Does anyone have any idea what's going on? My apologies in advance if a similar matter has already been treated in another thread, and my thanks for everyone's kind help with problems in the past.