Pengkodean error FTP dibagi menjadi 5 kelompok kode, 100, 200, 300, 400, dan 500. Berikut ini pesan error atau kode error FTP. 100 Codes The requested action is being taken. Expect a reply before proceeding with a new command. 110 Restart marker reply. 120 Service ready in (n) minutes. 125 Data connection already open, transfer starting.