認証ログのログメッセージ値が何を意味するのかわかりませんか？

接続が切断された理由コードです。 ~から源泉:

/* disconnect reason code */

#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT     1
#define SSH2_DISCONNECT_PROTOCOL_ERROR                  2
#define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED             3
#define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED      4
#define SSH2_DISCONNECT_RESERVED                        4
#define SSH2_DISCONNECT_MAC_ERROR                       5
#define SSH2_DISCONNECT_COMPRESSION_ERROR               6
#define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE           7
#define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED  8
#define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE         9
#define SSH2_DISCONNECT_CONNECTION_LOST                 10
#define SSH2_DISCONNECT_BY_APPLICATION                  11
#define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS            12
#define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER          13
#define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE  14
#define SSH2_DISCONNECT_ILLEGAL_USER_NAME               15