I recently found that there's a hardcoded rule for allowing all ICMPv6 communication which obviously isn't working at all. I get a whole lot of "no usable rule found" spam when running uTorrent 1.9 from ICMPv6, originating from system. Just wanted to add some IPv6 info: PID=4, that's system, not sure why it doesn't just say system The pings appear to happen on vista bootup/login. In particular Random blocked web data? Other PC sending data to itself that I can see? ..then sending it to a non existing IP? ..then finally to the router, why can I see it? System sending IGMP?