Hackers break into Obamacare website

[Shlomo]

Hackers break into server for Obamacare website: U.S. officials

(Reuters) - An unknown hacker or hackers broke into a computer server supporting the HealthCare.gov website through which consumers enroll in Obamacare health insurance, a government cybersecurity team discovered last week, apparently uploading malicious files.

http://www.reuters.com/article/2014/09/05/us-usa-healthcare-cybersecurity-idUSKBN0GZ2RF20140905

[angryChineseKahanist]

That's not very hard.
But how do you "break into" what's wide open?
Can't break into a store who's doors are not locked.