{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to set up ports on Ubuntu system that do not need to be exposed to the outside world?","a":"Enter the following  command to view all the ports currently opened on the system:↵↵```↵sudo lsof -i :-↵```"}]}],"pr":"eef8af8ac2fcfdb88d7b73ae4fd8672503ef05c21dff439c36986bb97335f34a"}