C# FTP Upload Server Requires OPTS 'off' - WinSCP.SessionRemoteException: Error transferring file

// Setup session options
SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Ftp,
    HostName = this.Uri.Host,
    UserName = this.Credentials.UserName,
    Password = this.Credentials.Password,
    TimeoutInMilliseconds =300000,
};

var localFilePath = @"c:\data\test.png";
var remoteDir = @"/home/"; 

using (WinSCP.Session session = new WinSCP.Session())
{
    // Connect
    session.Open(sessionOptions);

    // Upload files
    TransferOptions transferOptions = new TransferOptions();
    transferOptions.TransferMode = TransferMode.Ascii;

    TransferOperationResult transferResult;
    transferResult = session.PutFiles(localFilePath, remoteDir, false, transferOptions);


    // Throw on any error
    transferResult.Check();

    // Print results
    foreach (TransferEventArgs transfer in transferResult.Transfers)
    {
   Console.WriteLine("Upload of {0} succeeded", transfer.FileName);
    }
}