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< snip >'McKinnon used automated software available on the Internet to scan tens of thousands of computers on U.S. military networks from his home computer, looking for ones that might be exposed due to flaws in the Windows operating system. Many of the computers he broke into were protected by easy-to-guess passwords, investigators said."

[FairfaxVA]

Sounds like he was using a simple network scanning tool and guessing at passwords. What an idiot.