i guess there's trophy maintenance going on...its happening to me too. i wouldn't sweat it. I can get online ok, but i can't sync trophy data either. I would just wait it out. Sony made an announcement today that this would happen temporarily.
It's obviously down right now, I have just been googling what the deal is with this error code because I have been getting it all night tonight (and morning now). I just hammered 3 Gold trophies from Prince of Persia and wanted to see where that got me. Oh well, no biggie as long as its only temporary.