PSN to receive maintenance tomorrow
Tomorrow, June 24, the PlayStation Network will see some downtime in order for maintenance to be done. The downtime will occur from 10 AM to 4 PM CST (4 PM to 10 PM GMT). During this period, you will not be able to access the store or play any titles online.
With Firmware 2.4 just around the bend, this could potentially have something to do with that update. We'll see in due time.