USB connection failure when device is in USB Host mode

Hello, Keil users,

I am trying to get a connection between LPC4357 and a U-Blox modem over USB.
First of all I connected the modem to PC, it was recognized correctly, it adds 6 COM ports.

I have looked at examples provided by Keil, and created a simple project where I initialize my MC as USB CDC Host. For the second test I took
another device based on the same MC that is initialized as a USB CDC Device and connected to a USB Host, created at a previous step, the connection between two LPC4357 MC is successful.
The next step was to try the connection with a modem. For debug purposes Event recorder was enabled. The problem is that I am getting PipeReceiveFailed event, of length 15, and error is 64. This error happens when I am trying to get the device status.

I have looked for this error and it is "Transfer handshake was stall".

Are there hints how to prevent this error and to establish the communication correctly?

I attach the screenshot of the event recorder

https://ibb.co/d1RniH

Here is the code listing

        usb_status = USBH_Initialize(0);
        if (usb_status != usbOK)
                printf ("InitFailure!\n");

        while(1){
                con = (USBH_CDC_ACM_GetDeviceStatus(0) == usbOK);
                if (con ) {
                        connected = true;
                        if (con == true) {
                                con_last = true;
                                LED_On(0);

                                USBH_CDC_ACM_Send(0, buff, 3);

                        } else {
                                con_last = false;
                                LED_Off(0);
                                }
                        } else {
                                osDelay(1000);
                        }
        }