Slight disclaimer: we do not usually beautify content from Reddit and put it up as an exclusive reveal. That is left for other blogs of repute.
A PSX-Scene.com moderator has put up a post on Reddit with a speculative reason (it may not be the real reason) as to why the PlayStation Network has been down for a long time now. Most of the information below comes from facts and logical inferences:-
Some days ago a new Custom Firmware (CFW) called Rebug was released for the PlayStation 3. A CFW allows the user to run unsigned content. What this usually means is that Homebrew games and applications can be made to run only on a PS3 running a CFW. Whenever a PS3 is flashed with a CFW, it cannot connect to the PlayStation Network (PSN) since some necessary files for the connection are overwritten (I am not very familiar with the internal dynamics of the system).
As is usual with CFWs, third party developers caught on and released a patch that allowed users to connect to the PSN via the PlayStation Developers Network. So far, so good.
However, the trouble began when some CFW users found out that the PSN did not bother verifying your credit card credentials whenever you enter it for purchasing a game. Apparently, since the CFW is on the developer’s network, it is a trusted network so security is lax.
What followed was a torrent of piracy (I think I may be on to something with that collective noun) that led to Sony shutting down PSN and keeping mum about it for days on end.
This is a seemingly logical explanation since the chronology allows for that conclusion (from the post):-
1. Rebug was released on 3/31/11.
2. First guides of how to use the dev network to get back on COD games on 4/3/11.
3. Word of “shady” sites finding a way to pirate PSN content via the dev networks on 4/7/11 (basing this on posts I had to delete on the website). 4. PSN goes down on 4/20/11
Since Anonymous vehemently denies any hackingattempt on the PSN this could definitely be one of the reasons. It also fits under the external intrusionexplanation allegedly given by Sony, since this is technically external intrusion.