Error-Code,Description,Reference 1,Bad handle,[RFC2748] 2,Invalid handle reference,[RFC2748] 3,Bad message format,[RFC2748] 4,Unable to process,[RFC2748] 5,Mandatory client-specific info missing,[RFC2748] 6,Unsupported client-type,[RFC2748] 7,Mandatory COPS object missing,[RFC2748] 8,Client Failure,[RFC2748] 9,Communication Failure,[RFC2748] 10,Unspecified,[RFC2748] 11,Shutting down,[RFC2748] 12,Redirect to Preferred Server,[RFC2748] 13,Unknown COPS Object,[RFC2748] 14,Authentication Failure,[RFC2748] 15,Authentication Required,[RFC2748]