After the DDOS attack that occurred to the PlayStation Network today it seem that is Sony has fixed the issues with PS3 and PS Vita users. For the PS4 users? It seems that things are not the way it should be. In a tweet from the official PlayStation twitter account, It seems that things have stabilized a bit for Sony.
Network service is currently returning for PS3 and PS Vita users, but you may experience slowness or login issues as the network stabilizes
— PlayStation (@PlayStation) August 25, 2014
PSN has a scheduled maintenance for tomorrow and it seems that PlayStation users will go another day without complete access to PSN and its services.