I'm just a casual Flightgear user with very little coding experience so it's not surprising this has me stumped.
A few weeks ago, I discovered Phi--I ran it and was able to get the webpanel in the browser on a second machine. I could also log into it on my phone. I fired it up today, and I can still get the panel on my local browser (on the computer running flightgear), but I can no longer get it on my phone or my other computer. Has something changed? I'm running Ubuntu 16.04 on my Flightgear machine if that matters...