Sony has announced that PlayStation Network will be down tonight between 17:00 and 23:00 GMT for maintenance. Naturally, during this time PlayStation 3 and PlayStation Portable owners won’t be able to access PSN or play online games.
However, there is a way around this: players who are already online when maintenance begins will not be knocked off and can play normally. Regardless, the PSN Store, account and management options will still be unavailable.
There is some speculation that PSN security is being fortified by recent Sony hiree, ex-US Department of Defence man Philip Reitinger.