A dreaded 8001050F error blocks PlayStation Network access, trophy synchronization, PSN games, dynamic themes, and even retail titles such as Heavy Rain. Reports from “phat” PlayStation 3 owners state their console’s date rolled back, which may be the cause of the problem.
Slim PlayStation 3 owners appear to be unaffected. “Readers/followers are confirming that "slim" units (120/250 GB models) are connecting normally,” states the PlayStation Twitter account.
The PlayStation Blog says Sony has “narrowed down the issue and have engineers working to restore service.”