Users of the PlayStation Network are reporting problems with the service, and Sony has confirmed the "issues" with network services and the store on the PlayStation Network.
Here's how a company reprentative explained the problem on a PlayStation message board:
At the moment PlayStation®Network is currently experiencing issues and some users may encounter problems with network services and the store.
(An error code e.g. 80023102 may appear when trying to sign in)
Engineers are currently investigating the cause of these problems, and I will update here when more information is available.
If you'd like to hit "refresh" over and over again until the "all clear" is signaled, here's the link. The PlayStation Network, as you might know, has had some pretty serious stability problems in the past. Check out our PlayStation Network coverage for more.