Il peut y avoir plusieurs raisons qui expliquent un problème de connexion sur un serveur SFTP, mais ce n'est pas toujours simple de comprendre le message qui explique la raison.
Voilà donc un tableau présentant les différentes erreurs qui peuvent être rencontrées, ainsi qu'une brève description de l'erreur.
(Le tableau est présenté en anglais puisque les messages d'erreur s'affichent en anglais.)
| Message | Valeur | Description (en anglais) |
| ERROR_SSH_INVALID_IDENTIFICATION_STRING | 1 (0x0001) | Invalid identification string of SSH-protocol |
| ERROR_SSH_INVALID_VERSION | 2 (0x0002) | Invalid or unsupported version |
| ERROR_SSH_INVALID_MESSAGE_CODE | 3 (0x0003) | Unsupported message code |
| ERROR_SSH_INVALID_CRC | 4 (0x0004) | Message CRC is invalid |
| ERROR_SSH_INVALID_PACKET_TYPE | 5 (0x0005) | Invalid (unknown) packet type |
| ERROR_SSH_INVALID_PACKET | 6 (0x0006) | Packet composed incorrectly |
| ERROR_SSH_UNSUPPORTED_CIPHER | 7 (0x0007) | There is no cipher supported by both: client and server |
| ERROR_SSH_UNSUPPORTED_AUTH_TYPE | 8 (0x0008) | Authentication type is unsupported |
| ERROR_SSH_INVALID_RSA_CHALLENGE | 9 (0x0009) | The wrong signature during public key-authentication |
| ERROR_SSH_AUTHENTICATION_FAILED | 10 (0x000A) | Authentication failed. There could be wrong password or something else |
| ERROR_SSH_INVALID_PACKET_SIZE | 11 (0x000B) | The packet is too large |
| ERROR_SSH_HOST_NOT_ALLOWED_TO_CONNECT | 101 (0x0065) | Connection was rejected by remote host |
| ERROR_SSH_PROTOCOL_ERROR | 102 (0x0066) | Another protocol error |
| ERROR_SSH_KEY_EXCHANGE_FAILED | 103 (0x0067) | Key exchange failed |
| ERROR_SSH_INVALID_MAC | 105 (0x0069) | Received packet has invalid MAC |
| ERROR_SSH_COMPRESSION_ERROR | 106 (0x006A) | Compression or decompression error |
| ERROR_SSH_SERVICE_NOT_AVAILABLE | 107 (0x006B) | Service (sftp, shell, etc.) is not available |
| ERROR_SSH_PROTOCOL_VERSION_NOT_SUPPORTED | 108 (0x006C) | Version is not supported |
| ERROR_SSH_HOST_KEY_NOT_VERIFIABLE | 109 (0x006D) | Server key can not be verified |
| ERROR_SSH_CONNECTION_LOST | 110 (0x006E) | Connection was lost by some reason |
| ERROR_SSH_APPLICATION_CLOSED | 111 (0x006F) | User on the other side of connection closed application that led to disconnection |
| ERROR_SSH_TOO_MANY_CONNECTIONS | 112 (0x0070) | The server is overladen |
| ERROR_SSH_AUTH_CANCELLED_BY_USER | 113 (0x0071) | User tired of invalid password entering |
| ERROR_SSH_NO_MORE_AUTH_METHODS_AVAILABLE | 114 (0x0072) | There are no more methods for user authentication |
| ERROR_SSH_ILLEGAL_USERNAME | 115 (0x0073) | There is no user with specified username on the server |
| ERROR_SSH_INTERNAL_ERROR | 200 (0x00C8) | Internal error of implementation |
| ERROR_SSH_NOT_CONNECTED | 222 (0x00DE) | There is no connection but user tries to send data |
| ERROR_SSH_CONNECTION_CANCELLED_BY_USER | 501 (0x01F5) | The connection was cancelled by user |
| ERROR_SSH_FORWARD_DISALLOWED | 502 (0x01F6) | SSH forward disallowed |
| ERROR_SSH_ONKEYVALIDATE_NOT_ASSIGNED | 503 (0x01F7) | The event handler for OnKeyValidate event, has not been specified by the application |
| ERROR_SSH_GSSKEX_SERVER_ERROR_MESSAGE | 601 (0x0259) | GSS KEX server error. |
| ERROR_SSH_GSSAPI_SERVER_ERROR_MESSAGE | 603 (0x025B) | GSS API server error. |
| ERROR_SSH_TCP_CONNECTION_FAILED | 24577 (0x6001) | TCP connection failed. This error code defined in SBSSHForwarding unit. |
| ERROR_SSH_TCP_BIND_FAILED | 24578 (0x6002) | TCP bind failed. This error code defined in SBSSHForwarding unit. |