I've had a request from my customer's overzealous IT admin for ALL the servers / ports that my deployed server box (physical) uses.
It's running a debian jessie, but that should be besides the point.
Just so we're clear: they will be blocking EVERYTHING I don't specify, including security apt updates, NTP time sync, etc,. etc.
I've done some googling (hours of it), but turned up nothing.
So, is there a feasible method of finding the requested info, except for grabbing all the traffic emanating from the box for a month?