I think those log messages are intended to check if Pingbacks and Trackbacks are working -- not the ping services.
If you have a link in the Post you are creating, this process looks for URLs in your post, and tries to send Pingbacks and/or Trackbacks to those URLs.
The ping services are much simpler than Pingbacks & Trackbacks, because all it does is send an HTTP request/ping to each of the URLs. The code doesn't even process the response from the ping service, since there's no action that needs to be taken
based on the response.
The ping services code is in the BE core, Ping\PingService.cs file. You could add logging statements in there, and then re-compile (or run in VS) to see what's going on. Or you could copy over some of that code into the SendPings.cs extension,
add logging, and call that code instead of letting it call the normal PingService.Send().
My guess is that the Ping Services are working, but I don't think there is necessarily much you can expect from the services once they are alerted of a new post you created. Actually, I'm not familiar with what the ping services normally do in response
to a ping they receive. They probably get pinged a lot from lots of sources, so have some system in place to deal will all those incoming pings.