404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=44pQg2TztBIDbeNot456FmlodxgrymV7p8oQC--AUO0F5escmTS57tQWCT5JCpla27VNtEIcO9M2XGR5dzxXk-MK9VbNm0vrkgyTSQvCbPROLxLXocidfluvlZMbvaRy
was not found on this server. That’s all we know.