Hi everyone, previously when I plugged in my mbed into my laptop it worked fine. But after a few times of using it, the sentence “usbConnect error: Failed to execute ‘open’ on ‘USBDevice’: Access denied.” appeared on the screen. I’ve tried plugging it into another laptop and it works just fine. I’ve…

Hello, usually is good share more context your board and info about your debugger System on PC from where this error come from (what app) check what a driver is used on both laptops - same or not BR, Jan

I am experiencing a similar issue. My setup is as follows, Operating System : Windows 10 / Ubuntu 20.04 (I am using a dual booted PC and am experiencing this issue independent of which OS I am on) Device : mbed NXP LPC1768 IDE : Keil Studio Cloud When I attempt to build and run my program I am p…

Hello, that makes more sense. Keil Studio Cloud uses the webUSB API and this must be supported by the hardware. Please be so kind and take a look to this - New beta firmware for LPC1768 - Keil Studio - Arm Mbed OS support forum BR, Jan

Hello, I have the same problem, I have Windows 11 Device: mbed FRDM-K64F IDE: Keil Studio Cloud When I try to compile and run my program, I get the error “USB connection error: Could not execute ‘open’ on ‘USB Device’: Access is denied.” Previously, I did not have this problem. Greetings

A possible cause of this is if you have another program open that is claiming the USB device (e.g. like a desktop IDE). Could you check whether this is the case please?

How do I check if some other program is claiming the USB device? As it worked once when I updated the firmware to work on webUsb but when I installed mbed studio and mbed cli, it was showing the error. So I uninstalled both of them, but still showing the same problem.

On Windows just open the Windows command line (CMD) and type MODE then you will see a list of all active not used COM ports. When your COM number is not in that list then it is used by some app. Alternatively you can use directly the specific COM port number. Let’s say your board is on COM13 so…

[image] Sofea_Ssss: Hi everyone, previously when I plugged in my mbed into my laptop it worked fine. But after a few times of using it, the sentence “usbConnect error: Failed to execute ‘open’ on ‘USBDevice’: Access denied.” appeared on the screen. I’ve tried plugging it into another laptop and …

USB access denied

Mbed OS

Sri_Karthik_Chigurua (Sri Karthik Chiguruapati) November 20, 2023, 2:51pm 7

Same problem here

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USB access denied

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