That's probably just the default, you can set it up with any port you want using the --port flag on the remote side.
ie.
holesail --connect biglongkey --port 9988
What the port is on the other machine doesn't matter, although I will often keep it the same so its easy to know which is which (until naming comes to the manager).
So if the pinokio tool is running 7860 on the "server" machine (my linux), then ill connect and put it on the same port for the remote machine (macbook). But the computers aren't talking over that port, its simply the local "door" that the service is accessible on when you open it on your computer.
Hope that helps
Hm OK, maybe the failed connection is more of a problem with the android app then. My 2nd laptop connected just fine.
Could be very well a problem with the android app, we are completely redoing it at the moment.