el capitan – App-specific HIGHTAIL EXPRESS "Accept incoming network connections"

I am aware that this request is important for many applications.

On Hightail Express, I choose Decline when I'm asked to, and it seems to be working normally (but it's not great!). So I have allowed but no change to see. How do I find out exactly what makes admitting or rejecting?

By the way – If you search Google for "Hightail Express" to accept incoming network connections, almost nothing is displayed. Is that a stupid question?