404. That’s an error.
The requested URL /index.php/users/oauth/?server=facebook&nv_redirect=sM3qCzaO_BB8HoR3RSI554EpZmWvCCBrOAlF6pDGtI5geIgke5AjCZlm4DOhOPB5qPa4_5761mWdOH_AX4Bwx4HCsQLtR16cM5_TJILWPxHsESSbzRTzMgs7ik3P-wgB
was not found on this server. That’s all we know.