Can anyone else repeat this with the same results?

Configure PingPlotter Pro to query/monitor a WinXP machine on TCP port 23.

Do you get packet-loss, or does your graph simply indicate latency?

Via Wireshark, I see PPro send a SYN to port 23 on the XP machine, then I see a RST as a response. This would seem to be a false positive.

Is this "statefulness" beyond the scope of PPro?