Hey Samyaza,

Thanks for writing in. That's a great question!

TCP requires WinPcap to work, and typically VPN's don't like to play nicely with WinPcap. You can read more about that in this article (specifically question 5):

https://www.winpcap.org/misc/faq.htm#Q-5

You can ping using TCP on a VPN, but traceroute is a different story, because without WinPcap, PingPlotter cannot separate the hops.

You may want to try using UDP to see if that gets a response.

I hope this helps. If you need any other help with this or anything else, feel free to write us back at any time.

Cheers!

-Phillip