Ah, that answers my own thread. I posted it just a minute before seeing yours. I thought I was the only one getting this error. :P

I wish PSN would at least send maintenance notifications via PS4. Or maybe just put a 'undergoing maintenance' message next to their 'online' status when visiting their site. Considering how horrible that DDoS attack was last time, a bit of disclosure and clear information would go a long way for PS4 users.