PlayStation 3 and PSP owners have been unable to connect to the Internet, play games online or download new titles. This chronicles what led to this problem and what has happened since it occurred. Sony’s working on a fix, user data has been compromised, and everyone has something to say on the matter. However, it’s important to understand how we got here. Below is the timeline of the PSN outage. It chronicles the events leading up to the breach and the events surrounding it.
Source: https://thehackernews.com/2011/05/psn-security-breach-timeline.html