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 private bool IsPortOpen(string host, int port, TimeSpan timeout)
{
    try
    {
        using (var client = new TcpClient())
        {
            var result = client.BeginConnect(host, port, null, null);
            var success = result.AsyncWaitHandle.WaitOne(timeout);
            if (!success)
            {
                return false;
            }

            client.EndConnect(result);
        }
    }
    catch
    {
        return false;
    }
    return true;
}