'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!

Start with the SftpClient(ConnectionInfo) and host/username/password constructors, then follow their Connect paths to compare how each establishes the SFTP connection. The report provides no repository files or tests and lacks server logs, so done would require reproducing the constructor difference or identifying why the two paths behave differently against the updated server.