Unable to get online with your PlayStation 3? Well there is a good reason, as the PlayStation Network is under going scheduled maintenance until 10PM PST tonight.
Here are a few other services you will be unable to access as well:
During the maintenance, you will be unable to access the following services:
PlayStation Store on PS3 and PSP.
PlayStation Network Account Management.
PlayStation Network Account Registration.
So put your worries aside fellow PlayStation 3 and PSP gamers, this is just maintenance and after 10PM PST everything should be back to normal.
Source: PlayStation Blog