August and December 2012: An Internet-wide hacker attack makes Clinton’s private server even more vulnerable.

An anonymous hacker using a computer in Serbia scans hundreds of millions of Internet addresses for accessible openings, called “ports.” Clinton’s private server is scanned by this hacker in August 2012 and again in December. The hacker’s millions of results are then made widely available on-line. It is unknown if anyone looking at this data figures out if the server belongs to Bill and Hillary Clinton, although the name “clintonemail.com” is a clue. (The Associated Press, 10/13/2015)