This is becoming an all too common occurrence. PSN is completely down again, with the “cannot connect to the server” NW-31201-7 error showing up for many users.
There’s no scheduled maintenance yet again, and no signs of what’s causing it yet. Perhaps someone tripped over the delicate piece of string at Sony HQ which holds it together, or it might be the work of a hacker group yet again. We’ll try to find out and keep you updated.
Of course, the PSN status page says that it’s online currently, but that’s usually a bit behind everyone else, so keep your eyes on here, and let us know if it comes back up, of course.
UPDATE: We’ve been able to sign in, and PSN appears to be coming back online.