Sony is confirming that an error is preventing some customers from connecting to the PlayStation Network today. This problem affects PS3 models other than the new slim PS3. Sony believes the error is being caused by a a bug in the clock functionality. Sony is advising PS3 owners to not use their PS3 system until the error is fixed. Sony provided the following list of errors:
The date of the PS3 system may be re-set to Jan 1, 2000.
When the user tries to sign in to the PlayStation Network, the following
message appears on the screen; "An error has occurred. You have been
signed out of PlayStation Network (8001050F)."
When the user tries to launch a game, the following error message appears
on the screen and the trophy data may disappear; "Failed to install
trophies. Please exit your game."
When the user tries to set the time and date of the system via the
Internet, the following message appears on the screen; "The current date
and time could not be obtained. (8001050F)"
Users are not able to play back certain rental video downloaded from the
PlayStation Store before the expiration date.
Kotaku is posting updates on the PS3 global network lockdown here.
Sony is 
