Use a personal firewall. Configure it to prevent other computers, networks and sites from connecting to you, and specify which programs are allowed to connect to the net automatically.
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About Kevin Mitnick
Kevin Mitnick was a 20th-century American hacker. Kevin David Mitnick was an American computer security consultant, author, and convicted hacker. In 1995, he was arrested for various computer and communications-related crimes, and spent five years in prison after being convicted of fraud and illegally intercepting communications. Read more on Wikipedia →