Ubuntu – Which applications are using internet

installed-programsinternetlsof

How can I check which applications are using internet?
How to block internet accessing one particular application?
Is there any GUI tool that exist for it in Ubuntu Software Centre?
Thanks in advance!

Best Answer

lsof -i will list the applications that are accessing the network. There are some helpful examples in the man page but you might also want to look at Track network connections with LSOF on Linux.