I am checking a log and for the first time, see a firewall exception as follows: [HKLM\~\services\sharedaccess\parameters\firewallpolicy\standardprofile\GloballyOpenPorts\List] "10421:UDP"= 10421:UDP:SingleClick Discovery Protocol "10426:UDP"= 10426:UDP:SingleClick ICC All I can find is that it's a 'Dell thing'. Thing is, I have 2 Dell machines running currently without this exception. I find that the Worm/Agobot.54352 connects to the following IRC Server to deliver system information and to provide remote control using this port: Server: blast.p********** Port: 10421 Basically the same post is all over the internet but Google and Wiki let me down! Can someone please explain? I could just think it means using a single click instead of a double click to open or execute. If that's it, I still don't understand why it's an exception.