SSH Disconnect & Channel Codes

SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT

SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT (1) is sent when the server refuses the connection because the client host is not permitted to connect.

SSH_DISCONNECT_PROTOCOL_ERROR

SSH_DISCONNECT_PROTOCOL_ERROR (2) is sent when an SSH protocol violation is detected.

SSH_DISCONNECT_KEY_EXCHANGE_FAILED

SSH_DISCONNECT_KEY_EXCHANGE_FAILED (3) is sent when the SSH key exchange (KEX) negotiation fails.

SSH_DISCONNECT_RESERVED

SSH_DISCONNECT_RESERVED (4) is a reserved disconnect code in RFC 4253 §11.

SSH_DISCONNECT_MAC_ERROR

SSH_DISCONNECT_MAC_ERROR (5) is sent when an SSH packet's Message Authentication Code (MAC) does not verify.

SSH_DISCONNECT_COMPRESSION_ERROR

SSH_DISCONNECT_COMPRESSION_ERROR (6) is sent when decompression of an SSH packet payload fails.

SSH_DISCONNECT_SERVICE_NOT_AVAILABLE

SSH_DISCONNECT_SERVICE_NOT_AVAILABLE (7) is sent when the client requests an SSH service that the server does not support or has disabled.

SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED

SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED (8) is sent when the server does not support the SSH protocol version offered by the client.

SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE

SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE (9) is sent when the server's host key cannot be verified by the client.

SSH_DISCONNECT_CONNECTION_LOST

SSH_DISCONNECT_CONNECTION_LOST (10) indicates the SSH connection was lost unexpectedly.

SSH_DISCONNECT_BY_APPLICATION

SSH_DISCONNECT_BY_APPLICATION (11) is the clean, normal disconnect code sent when an application terminates the SSH session intentionally.

SSH_DISCONNECT_TOO_MANY_CONNECTIONS

SSH_DISCONNECT_TOO_MANY_CONNECTIONS (12) is sent by the server when it has reached its maximum concurrent connection limit.

SSH_DISCONNECT_AUTH_CANCELLED_BY_USER

SSH_DISCONNECT_AUTH_CANCELLED_BY_USER (13) is sent when the user explicitly cancels an in-progress authentication attempt.

SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE

SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE (14) is sent when all available authentication methods have been exhausted without success.

SSH_DISCONNECT_ILLEGAL_USER_NAME

SSH_DISCONNECT_ILLEGAL_USER_NAME (15) is sent when the username provided by the client is syntactically invalid.

SSH_OPEN_ADMINISTRATIVELY_PROHIBITED

SSH_OPEN_ADMINISTRATIVELY_PROHIBITED (1) is sent in SSH_MSG_CHANNEL_OPEN_FAILURE when the server refuses to open a channel due to administrative policy.

SSH_OPEN_CONNECT_FAILED

SSH_OPEN_CONNECT_FAILED (2) is sent when the server attempted to open the requested channel connection but the underlying TCP or socket connection failed.

SSH_OPEN_UNKNOWN_CHANNEL_TYPE

SSH_OPEN_UNKNOWN_CHANNEL_TYPE (3) is sent when the client requests a channel type that the server does not recognize or implement.

SSH_OPEN_RESOURCE_SHORTAGE

SSH_OPEN_RESOURCE_SHORTAGE (4) is sent when the server cannot open the requested channel due to resource exhaustion.