Today Sony Digital Platforms Community Manager Tempest_Fire announced PSN maintenance scheduled for Wednesday, September 25, 2013.
Below are the details, to quote: Hi everyone, We wanted to take a moment to let everyone know that there is a planned maintenance for PlayStation Network scheduled for Wednesday, September 25th from 9:15AM to 3:15PM Pacific Time (12:15 PM to 6:15 PM Eastern). To clarify, this is a 6 hour maintenance.
If you've signed onto PSN over the past few days, you'll still be able to play online and access apps during this period, but you may receive a maintenance notification when attempting to access the PlayStation Store, PlayStation Home, and Account Management as these services will be unavailable. Be sure to sign in now if you wish to access the Network during this maintenance window.
Thanks for your patience during this maintenance timeframe, and we apologize for any inconvenience this may cause.
For Europe (via Online Support Coordinator SuperFastZombie), to quote: Hi guys,
There is PSN Maintenance scheduled for Wednesday 25th September from 15:00 until Thursday 26th September 03:00 BST.
For the duration of the maintenance you will be unable to log into the PlayStation Network, Account Management and the PS Store. PS Home will also be unavailable.
Some users may be able to sign in however, the services listed above will still be unavailable during the maintenance window.
There may be some additional downtime after the maintenance period for testing purposes. Any questions please ask.
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