I got this twice today, once at the time this post was made and another 6 hours before (8pm PT). Both times it took 1 hour for the servers to come back up.
EU PSN usual downtime happens at 8pm PT, it seems (I don't live in USA, I don't even know what PT stands for). But its usually only 10 minutes or so.
This has nothing to do with a restart, me, my brother and some friends keep recieving this error since 1,5 week. Sometimes 5 times a hour sometimes 1 a day.
The most annoying: It happens olmost everytime at the end of an arkfall or siege. So your ****ed, no keys, loot or XP.
Dunno what the developers are doing at Trion, but it's about time to hang a few to make a statement. I paid enough, and the game is getting worse every day.