404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=_AMmj9xh5q4zpOvrWdyUoHVd2Ys6wPi4CaGwqLckRWyMtxXjLGy51rgK5uPLnnfx was not found on this server. That’s all we know.
/users/oauth/?server=facebook&nv_redirect=_AMmj9xh5q4zpOvrWdyUoHVd2Ys6wPi4CaGwqLckRWyMtxXjLGy51rgK5uPLnnfx