The maintenance will last eight hours, from 16:00 to 00:00 GMT.
Online gameplay is still expected to be available for users who sign into their PSN account in the period before the downtime have the authentication details cached. If the details are not cached you will be able to sign in once the maintenance starts, or play your games online.
The move comes on the heels of Sony resetting passwords for thousands of PSN accounts as a precaution after "detecting irregular activity" on the network.
Heads up > There will be Network maintenance on PSN - Monday 9th/Tuesday & 10th Dec between 16:00 and 00:00 GMT. Thanks for your patience.
-- PlayStation Europe (@PlayStationEU) December 6, 2013
Written by: Andre Yoskowitz @ 6 Dec 2013 9:47