It's likely that a firewall or router at your side is discarding timed out ICMP echo request *replys*. There is a known problem with an old bios for the Cisco 675 that does this - and I'm sure there are other routers that exhibit this problem as well.<br><br>If you want to conclusively eliminate Ping Plotter itself as a source of the problem, try using the command line utility "TRACERT" (comes with Windows) to see if it behaves similarly to Ping Plotter.<br><br>