'An established connection was aborted by the server.' when passing connection info to the constructor

This is non urgent because there is a simple workaround, but I thought it might be worth reporting (at least partly because I couldn't find a solution on Google and only stumbled across this one by luck.

var targetFtpHost = "sftp.myserver.com";
var targetFtpHostUserName = "myUsername";
var targetFtpHostPassword = "myVerySecurePassword";

var connectionInfo = new ConnectionInfo(
    targetFtpHost, 
    22, 
    "sftp", 
    new PasswordAuthenticationMethod(targetFtpHostUserName, targetFtpHostPassword));

using (var sftp = new SftpClient(connectionInfo))
{
     sftp.Connect();
...

Up until Monday, this code was working to create a connection to the server. Then on Monday the server was updated and it started failing with the error 'An established connection was aborted by the server.' when Connect was called. (I think the server in question is using Globescape but I don't have access to it so unfortunately can't pass on any logs/info from there about what might have caused the problem).

When I replaced the line setting up the sftp object with
using (var sftp = new SftpClient(targetFtpHost, targetFtpHostUserName, targetFtpHostPassword))
it started working again!

Inizia con SftpClient(ConnectionInfo) e i costruttori host/username/password, quindi segui i relativi percorsi Connect per confrontare il modo in cui ciascuno stabilisce la connessione SFTP. Il report non fornisce file o test del repository e non include log del server, quindi per considerare il lavoro completato sarebbe necessario riprodurre la differenza tra i costruttori oppure identificare perché i due percorsi si comportano in modo diverso con il server aggiornato.