Re: random open ports
My guess is the same as Mister.Vash's
I have the same situation. I would scan with the gnome tool several times. There is usually one consistent port open (unknown service) and new additional ports created each time.
I would do a netstat -ta after each scan and notice that the consistent port would have localhost for Local Address and Foreign Address. The other random ports would sometimes show up and sometimes not. When the random ports do show, the ports are in a listening state (sometimes with a localhost for Foreign Address).
The consistent port is most likely the local loopback port listening to itself.
As a temporary test, I decided to block my local loopback with some iptables rules.
When I scan with gnome-nettool and netstat, I don't have any open ports.
Ubuntu 12.04. 64bit. Desktop version. Gnome 3.4.1 O͜͡.O~