Navigation

How to understand SFTP connection errors?

There may be several reasons for a connection problem on an SFTP server, but it is not always easy to understand the message that explains the reason.So here is a table of the different errors that can be encountered with a description.

Definition Value Description
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.


Did you find it helpful? Yes No

Send feedback
Sorry we couldn't be helpful. Help us improve this article with your feedback.