Can't connect to the PlayStation Network for anything? You're not alone, and Sony Computer Entertainment knows it. They have confirmed outages for their online network, and are working to get to the root of the connection problems.
Thus far SCEA has not explained what exactly the problem is or where it could be coming from, though Kotaku did managed to squeeze something related to "emergency maintenance" out of Sony support staffers.
While we are investigating the cause of the Network outage, we wanted to alert you that it may be a full day or two before we’re able to get the service completely back up and running. Thank you very much for your patience while we work to resolve this matter. Please stay tuned to this space for more details, and we’ll update you again as soon as we can.
In the meantime, sit tight and play Mortal Kombat's multiplayer offline.