An established connection was aborted by the server

i am using Renci SSH.Net to do ssh connection, most of my connections done successfully and no issue
but now i have an issue connecting to server
i am getting An established connection was aborted by the server

the below is the simple code i used

using (var client = new SshClient(Host, 22, Username, Password))
{
client.Connect();
// the exception raise here
var result = client.RunCommand(" show ver ");
client.Disconnect();
}
i asked the server admin for the log and he sent to me the below log result from the server :

Sep 7 17:21:21.228 [GENERAL] [ERROR] SSH_input_control[0]: key exchange failed for instance: 4568 status: -5904
Sep 7 17:21:21.228 [GENERAL] [] SSH_input_control[0]: connection id: 0 exiting...
Sep 7 17:21:21.228 [GENERAL] [ERROR] SSH_cleanup[0]: SSH/SFTP: unverified session terminated

appreciate your support

Inizia da SshClient.Connect() e dal log dello scambio di chiavi del server; determina se il fallimento è riproducibile e se indica una modifica della libreria o della configurazione del server. Il report non specifica alcuna modifica al codice richiesta né alcuna condizione di successo, quindi non è possibile definire una correzione completata sulla base del solo issue.