In case that you don’t know PSN is scheduled for maintenance for Thursday, February 12. The service will be unavailable starting with 17:00, and it will last until 20:30 GMT.
During the maintenance, you won’t be able to log in neither to Account Management nor PlayStation Store. Also, the PlayStation home will be unavailable. As you probably already know, if you sign into your SEN account before the maintenance you’ll still be able to play online. More details can be found in the source link.
Source: PlayStation Forum