# Klipper cant connect to mcu

**URL:** <https://klipper.discourse.group/t/klipper-cant-connect-to-mcu/9987>\
**Category:** General Discussion\
**Created:** [August 18, 2023, 1:30am UTC](https://klipper.discourse.group/t/klipper-cant-connect-to-mcu/9987 "2023-08-18T01:30:35Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\
**Post date:** [August 18, 2023, 7:50am UTC](https://klipper.discourse.group/t/klipper-cant-connect-to-mcu/9987/3 "2023-08-18T07:50:22Z")

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> [@LifeOfBrian](#):
>
> Your upload of the klippy.log seems to be broken.

fixed

@cbrew  
Your error is:

```auto
mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0'

```

Check [Debian Bullseye Bug causing Klipper to no longer find the printer board](https://klipper.discourse.group/t/debian-bullseye-bug-causing-klipper-to-no-longer-find-the-printer-board/8231)

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