There is not a way to do a simple and direct ping with TCP using PingPlotter (sorry).

We do, however, have a plug-in for PingPlotter Pro (PingPlotter Pro is required - Standard won't do it) that does TCP connects on a port - it negotiates through the TCP handshake (a "TCP Connect"), which is a generic test for server responsiveness. The TCP handshake is a little bit more than a ping, but it will give you responsiveness results.

If you're interested, you can download this script here:

http://www.pingplotter.com/beta/TCP%20Connect.zip

To install this script, you'll want to extract the contents of the zip file into your scripts directory (usually C:\Program Files (x86)\PingPlotter\Scripts), and then close and relaunch the program. Once you've relaunched the program, you'll want to set up a new named configuration (which we cover in more detail here):

http://www.pingplotter.com/manual/named_configurations.html

and set the "packet type" to "TCP connect" (and you'll have the ability to choose which port you'd like to target from there).

Go ahead and try this and let me know where this leaves you.

Cheers!

-Phillip