See connections in a real time enviroment

Under Linux

In order to observe your outgoing network connections and open ports, type in a terminal in real time:

sudo watch lsof -i

Items displayed:
The name of the program making the connection (COMMAND) and its PID
The user who started the program (USER)
The login

This display is updated every 2 seconds.

Example:

Under Windows

Using netstat utility allows you to display a connection status, but the information displayed screen is not updated when the connections change. Netstat shows results only once.
Using netstat

To use netstat
Start/ Run/ cmd and in the MS-DOS type the command:

netstat -ano

The connections will be displayed.

Example: