# DietPi mcu Permission Denied **URL:** \ **Category:** General Discussion\ **Created:** [January 19, 2026, 10:53pm UTC](https://klipper.discourse.group/t/dietpi-mcu-permission-denied/25532 "2026-01-19T22:53:26Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\ **Post date:** [January 20, 2026, 1:18am UTC](https://klipper.discourse.group/t/dietpi-mcu-permission-denied/25532/9 "2026-01-20T01:18:59Z")
Sorry, didn’t read your attached klippy.log and got you wrong with the title. ```auto 7260 serial = /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0 . . 7325 mcu 'mcu': Unable to open serial port: [Errno 13] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 13] Permission denied: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0' ``` See Sineos perfect [How-To Trouble-Shoot](https://klipper.discourse.group/t/how-to-trouble-shoot/6326#p-17533-connection-problems-to-the-printer-board-4). --- _[View the full topic](https://klipper.discourse.group/t/dietpi-mcu-permission-denied/25532)._