404. That’s an error.
The requested URL /index.php/users/oauth/?server=facebook&nv_redirect=XFbSndy4QnV_POqpNfA7Uu6kv_V4fTpUsNorTu87jQ8sdeYJeouZTBza91D3glEY_5c0MwTDwFSYnUB5uc9xzk1U5yYAJcwNnIscR5gZhrNOp_DU3aXZ9OVEJpxTOqgU
was not found on this server. That’s all we know.