Networking icon in tray, orange underline - what does it mean?

[packzap]

The orange underline is now gone.  I think it had something to do with the wifi network connection, altho there was no explanatory information when clicking "connection information" for the icon. 

I know if the connection is down, the icon turns to a different color, but cannot find any explanation in the Linux Lite documentation about what the orange underline means and other various display changes of the network tray icon when network parameters change.