Address already in use Unity Android

I am trying to run an HTTP Listener in an Android application, while I get an exception

SocketException: Address already in use

Unity Player does not produce errors, just like the build for Windows. netstat on the device shows. that the port is not occupied by anyone, what could be the problem? Maybe something needs to be added to the manifest?

My code (port 37273)

 private void Listen()
{
    Debug.Log("START HTTP LISTENIER!");
    listener = new HttpListener();
    listener.Prefixes.Add("http://localhost:" + port.ToString() + "/");
    listener.Prefixes.Add("http://127.0.0.1:" + port.ToString() + "/");
    listener.Prefixes.Add("http://*:" + port.ToString() + "/");
    listener.Start();
    while (connect)
    {
        try
        {
            Process(listener.GetContext());
        }
        catch (Exception ex)
        {
            Debug.Log("HTTP listener context Exeption: " + ex.ToString() + "\n  " + ex.Message);
        }
    }
}

StackTrace

05-08 07:42:15.751 4606 4699 E Unity : SocketException: Address already in use 05-08 07:42:15.751 4606 4699 E Unity : at System.Net.Sockets.Socket.Bind (System.Net.EndPoint localEP) [0x00043] in <0813754e7cfa415ebfedff172c2dd6e0>:0 05-08 07:42:15.751 4606 4699 E Unity : at System.Net.EndPointListener..ctor (System.Net.HttpListener listener, System.Net.IPAddress addr, System.Int32 port, System.Boolean secure) [0x00047] in <0813754e7cfa415ebfedff172c2dd6e0>:0 05-08 07:42:15.751 4606 4699 E Unity : at System.Net.EndPointManager.GetEPListener (System.String host, System.Int32 port, System.Net.HttpListener listener, System.Boolean secure) [0x0009d] in <0813754e7cfa415ebfedff172c2dd6e0>:0 05-08 07:42:15.751 4606 4699 E Unity : at System.Net.EndPointManager.AddPrefixInternal (System.String p, System.Net.HttpListener listener) [0x0005e] in <0813754e7cfa415ebfedff172c2dd6e0>:0 05-08 07:42:15.751 4606 4699 E Unity : at System.Net.EndPointManager.AddListener (System.Net.HttpListener listener) [0x0009c] in <0813754e7cfa415ebfedff172c2dd6e0>:0 05-08 07:42:15.751 4606 4699 E Unity : at System.Net.HttpListener.Start () [0x0000f] in <0813754e7cfa415ebfedff172c2dd6e0>:0 05-08 07:42:15.751 4606 4699 E Unity : at WebServer.Listen () [0x00093] in :0 05-08 07:42:15.751 4606 4699 E Unity : at System.Threading.ThreadHe