404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=1arMtBzGNCG21ZE-nllTJXs7DLEU-IxhjMiF1pTRvZUDF66IuiHvylPOW8o5XGUq7eA-nPSqfE3drHOM9ch03tDaLy9oEv0d9TL0z-Ps-bEBsmFJd3-wuF7F0g5AyQVD
was not found on this server. That’s all we know.