From aiononline.com

We are bringing the servers down at 6:00AM PST (more), September 25th, for maintenance. The purpose of this downtime is to tweak the way Private Stores work. A timer of 30 minutes will be implemented to prevent these shops from being abused as a means to prevent disconnection and alleviate queues.

The maintenance is expected to run no longer than 1 hour.

Thank you for your patience!