A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. (Exception from HRESULT: 0x800B0109) about sharpcaster HOT 5 CLOSED

try
{
    await _client.ConnectAsync(host, int.Parse(port), true);
}
catch (Exception)
{
    StreamSocket socket = ((IExposeBackingSocket)_client).Socket as StreamSocket;
    if (socket.Information.ServerCertificateErrorSeverity == SocketSslErrorSeverity.Ignorable && socket.Information.ServerCertificateErrors.Count > 0)
    {
        socket.Control.IgnorableServerCertificateErrors.Clear();
        foreach (ChainValidationResult ignorableError in socket.Information.ServerCertificateErrors)
        {
            socket.Control.IgnorableServerCertificateErrors.Add(ignorableError);
        }

        await _client.ConnectAsync(host, int.Parse(port), true);
    }
}