How to check if any background process is utilizing the internet connection?

Solution 1:

If you want the information in a Terminal you can run sudo lsof -i which will tell you all open internet connections (and listening processes too).

Your screenshot shows no anomaly, nothing unexpected (except maybe tomcat). So take one more step to investigate: you are going to look at actual bandwidth used in any connection with external hosts.

For this you need to

• install iftop by typing sudo apt-get install iftop
• run it with sudo iftop (or maybe sudo iftop -i wlan0 if the first command gives an error)

You will get a picture like

where the top line shows the overall used bandwidth (here very little bandwidth is used at the moment).

Solution 2:

To find if there’s a process to utilize Internet, close your browser or any other applications you know, then Open System Monitor > Resourses [tab] and check for Recieving and Sent amounts. There should be 0 as you see below: