PlayStation Network was unavailable Sunday morning due to a denial of service, or DDoS attack.
Sony President of Online Entertainment John Smedley confirmed the attack via Twitter. The official PlayStation Twitter feed also tweeted out they were aware of the issue and were working to get things up and running.
The network was partially restored for some users by 10 am PT, with services like Netflix available for streaming. However, when trying to access the PlayStation Store, a message read that it is currently undergoing maintenance. Sony previously announced that the PlayStation Network will be down tomorrow for scheduled maintenance. It's unclear right now whether the maintenance has started earlier than expected.
PlayStation Network Update
+ Posted by Sid Shuman on Aug 24, 2014 // Senior Manager, Social Media
Like other major networks around the world, the PlayStation Network and Sony Entertainment Network have been impacted by an attempt to overwhelm our network with artificially high traffic.
Although this has impacted your ability to access our network and enjoy our services, no personal information has been accessed.
We will continue to work towards fixing this issue and hope to have our services up and running as soon as possible.
We regret any inconvenience this may have caused.
As I checked the PSN status today it is already online. Try checking or signing in your account online. You can also try to
check the PSN Status, PSN Issues Sunday 8/24/14 and 8/25/14 /// Postponed Plannned PSN Maintenance Monday 8/25 .