Even though the DDoS attacks on the PlayStation Network were resolved, the network was still having issues in Europe (and some minor ones in the US) today, as Sony confirmed that the PlayStation Network, and the larger Sony Entertainment Network, were both suffering minor network outages.
However, it appears that the issues have been resolved- at the very least, it is now possible to log into PSN on a PlayStation 3 without any issues. You should be able to do it on the PlayStation 4 as well, although Sony hasn’t confirmed that those issues have been fully resolved yet, meaning you might, but probably won’t, experience some issues using PSN on that system.
“Thanks for your patience. PS3 sign in is now possible, and we’re continuing to look into issues on PS4. Network connectivity is being restored to the rest of the network. Thanks for your patience again.”
Have you had any issues logging into PSN today? What system have you been using, and what region are you from?