404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=1Y_LVVJrfxGA7ncF0zMyDvEAsDPNpgPXzBPiI2qYV5Im3T7GylHowx-WM2LA7uiYqK0EkVnLpY64cxz6COPcHZO6oTxLftOnAoVRMgoR5QMflPtWckAs7THaZOif0KCP
was not found on this server. That’s all we know.