NOC_EU wrote:
[EU] Issue With Account Authentication Error Message (Oct. 16)
Since the 2.05 Hot Fixes patch implemented on Oct. 15, 2013, we have confirmed an issue in which, during gameplay, players may see the “90000 Error†or “Square Enix Account Authentication Error†message displayed, and be disconnected from the server.
Investigation is currently underway, and we anticipate the implementation of a fix in the very near future. We apologise for any inconvenience and thank you for your patience and understanding.
Additionally, since the “Square Enix Account Authentication Error†message is one that is displayed when an account’s contract period has expired, if your account contract period has not yet expired it will be possible for you to log in again once you restart the game.
Since the 2.05 Hot Fixes patch implemented on Oct. 15, 2013, we have confirmed an issue in which, during gameplay, players may see the “90000 Error†or “Square Enix Account Authentication Error†message displayed, and be disconnected from the server.
Investigation is currently underway, and we anticipate the implementation of a fix in the very near future. We apologise for any inconvenience and thank you for your patience and understanding.
Additionally, since the “Square Enix Account Authentication Error†message is one that is displayed when an account’s contract period has expired, if your account contract period has not yet expired it will be possible for you to log in again once you restart the game.
Luckily for me it happened once I'd finished crafting, I've heard others were not so lucky ..