Unless you get lucky:
From Lodestone:
After the emergency maintenance on Aug. 25, 2013 at 12:00 a.m. to 3:00 a.m., to confirm the optimization of the matching server for the Duty Finder, we will be limiting the login more than usual. We will be relieving the limitation gradually as we see oversee the status.
We apologize for the inconvenience that this is causing everyone, but we please ask for continued cooperation for an overall stable environment.