Part of the PlayStation Network will be offline today as Sony conducts “regular maintenance” on certain PlayStation services. From PlayStation Blog:
As part of our efforts to continue to deliver you a world-class online entertainment experience on your PS3 and PS Vita devices, we will be performing maintenance on the network on Thursday, May 24th, starting at approximately 8:00 am PDT / 10:00 am EDT and concluding around 11:00pm PDT / 2:00am EDT.
Users will be unable to access the PlayStation Store and PlayStation home. However, Sony has advised that online play will not be affected, and Amazon and Netflix streaming will work as normal. We will let you know if anything changes regarding PSN services.