Sony Looking Into PS4 Login Errors
Some PlayStation 4 users are reporting login errors and Sony is looking into the issue.
We are aware that some PS4 users are experiencing login issues. We're currently looking into it and will provide an update soon.— PlayStation (@PlayStation) February 5, 2014
There's not much to report at the moment, other than the fact that Sony is aware of the problem and looking for a fix. It's possible that this could be an error resulting from the recent firmware update for the console, version 1.60, which went live last night.
If you're among those experiencing an issue, the best thing to do will be to follow @PlayStation on twitter and watch for updates.
Hopefully this gets resolved quickly, and hopefully (perhaps even more so) you are completely unaffected by this error. It doesn't appear be widespread at the moment, but it could become a widespread issue as more PS4 owners update their consoles.