This has presented problems for people playing online games and access to the store as well as issues with games that support dynamic trophies, such as Heavy Rain.
More problematic will be online only games such as MAG (Massive Action Game) or those trying to get hold of the new God of War III demo
At this point Sony themselves are still not sure what the problem is, the following tweets having appeared on the official Twitter page.
"We're aware that many of you are having problems connecting to PSN, and yes, we're looking into it. Stay tuned for updates."
"PSN status update: We're narrowing down the issue and continue to work to restore service to all. Updates as soon as we have them."
"PSN status update (part 2): Readers/followers are confirming that "slim" units (120/250 GB models) are connecting normally."