Recognizing the UNO on a com port

Using Arduino Interfacing w/ Software on the Computer
11

Which service is failing to detect the uno?

You can see in Windows devices that the uno is creating the COM port, so it might be a failure in your application. If you don't require a constant monitoring, I suggest to use a simple approach like this (C#):

private void UpdateSerialPortList()
{
    ClearSerialPortList();
    String[] ports = SerialPort.GetPortNames();

    if (originalPorts.Length == 0)
        originalPorts = ports;

    foreach (String s in SmartSort(ports))
    {
        ToolStripMenuItem i = new ToolStripMenuItem(s + ((Array.IndexOf(originalPorts, s) == -1) ? " (new)":""));
        i.Tag = "port_" + s;
        i.Click += new System.EventHandler(connectToToolStripMenuItem_Click);

        connectToToolStripMenuItem.DropDownItems.Add(i);
    }
}