Pretty much said it all in the title, because I'm aware (After much research) that there are a number of different codes to this error. Most famous one seems to be with a 409 error from ages past but that is not the case here. Many methods to fix it were done, from changing small details on FFXIV's boot .cfg file to even a system restore. I've read that it might be the 'servers getting slammed with requests', but my friends seem to be able to log in just fine. Note that I CAN input username and password but the message pops up before what I imagine would be the 'patch' moment could happen. This started today with the advent of 2.45. Finally, a pic of the screen I get: