I think this may or may not work, people on RTB are not co-operating with my test.
In the console, when you start up your Blockland, look for a line that says this:
UDP initialized on port...
With that number you see, enter that into the Advanced Config port. Then, after that, enter:pingMatchMakerLoop();
Into the console after starting a UPnP Server.
I have no idea if this works, as morons are screaming "JOIN MY SERVER" when I'm trying to figure this out.