Many PlayStation Network users are currently reporting problems using the service, including issues with signing into the network and accessing the PlayStation Store.
We booted up a PlayStation 4 and were unable to load the PlayStation Store, check out our friends list or profile, or even see the trophies we had earned. The store is also currently inaccessible via a web browser:
Some NeoGAF users are saying they're seeing a message notifying them that the PSN is currently offline for maintenance on both PS4 and PlayStation Vita. The downtime appears to be affecting users in North America as well as Europe, according to that NeoGAF thread.
For what it's worth, Sony's PSN status page says as of this writing that "all services are up and running." The network was down for about 12 hours on Jan. 4, and Sony later extended PlayStation Plus subscriptions by one day as a make-good for the outage.
Update: The PlayStation support site now features a red banner at the top that says Sony is running maintenance operations on the PlayStation Network, and the company acknowledged PSN issues on Twitter.
Update 2: Sony hasn't given the all-clear on Twitter yet, but the support site no longer features a red "maintenance" banner, and we've been able to use the PSN normally on our own PS4.