I've read most of the articles with "vulnerability block" mentioned in them but unfortunately none of them cover the specifics of our situation. Every day, basically at the same time of the day (between 12:15pm and 12:45pm) we get a report from NAV for Mac v11.1.1 that there was a blocked vulnerability. Our local office net (only two Macs) is connected to the internet via an "Airport" (Office Airport Extreme software v5.7) whose address (10.0.1.1) is the same as the "portscan-report" address. The log also says that it is an incoming attempt. The airport is connected to a DSL modem. The DSL modem does not have any firewall software. Both of our Macs do have the internal firewall turned on (Mac OS 10.4.11). Every time we get a block report, we also loose internet connection and we have to reboot the Macs. Could this be caused by a software glitch or could this be an actual attempt at entering our local net by an outsider? Any advise on what to do to solve this nuisance (of having to reboot, certainly NOT of being protected!) is appreciated.