The PlayStation Network remains out of service while Sony attempts to rebuild it.
On April 20, 2011, the PlayStation Network went down for mysterious reasons. Due to recent events involving Anonymous, some believed the downtime to be the result of an another attack by the hacker group, while Sony itself claimed that it shutdown the PSN due to an "external intrusion." As of now, Sony says that the PSN is still not accessible because it's being rebuilt.
The latest post from Sony's Patrick Seybold on the PlayStation Blog says: "We sincerely regret that PlayStation Network and Qriocity services have been suspended, and we are working around the clock to bring them both back online. Our efforts to resolve this matter involve rebuilding our system to further strengthen our network infrastructure."
Seybold admits that this is a "time-consuming" task, but adds that Sony "decided it was worth the time necessary to provide the system with additional security." He asks for a "little more" of PSN users' patience but doesn't give a timeframe for when the service might be restored.
It sounds like something went seriously wrong for Sony here, though Anonymous believes that it's all a cover-up for what is likely an internal issue. Sony saying that it needs to "rebuild" makes me think that the recent issue with Anonymous caused the company to go forward with a major change so that something similar would ideally never happen again.
Thanks for the tip Frank_Sinatra_!
Source: PS Blog