Am I safe from hackers with "closed" ports?

Episode 1056 (2:17:00)

Richard from Grand Rapids, MI

Richard ran Shields Up! recently, and it all came back as "stealth." Then he installed iTunes and now three results come back as "closed." Leo says that "closed" is OK. He won't want the results to come back as open. This is why Shields Up! was invented, because software like iTunes ends up making computers visible. Leo also recommends turning off Universal Plug and Play (UPnP).