# Error with klipper connecting to moonraker **URL:** \ **Category:** General Discussion\ **Created:** [August 10, 2023, 5:30pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873 "2023-08-10T17:30:26Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 10, 2023, 5:30pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/1 "2023-08-10T17:30:26Z")
### Basic Information: Printer Model: Creality Ender 3 S1 pro MCU / Printerboard: `klippy.log` …I am very new at this and I’m not sure why moonraker won’t connect to klipper, I’ve tried some stuff but I can’t make it work. The way I have it now it appears a message about moonraker that can’t connect to klipper and after some time another message appears about the mcu unable to connect. [klippy.log](https://klipper.discourse.group/uploads/short-url/2EwmbjNfkR136X5U1yDkDX0ze2N.log) (86.5 KB) Also, I’m using an old laptop with linux mint to run klipper ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 10, 2023, 5:32pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/3 "2023-08-10T17:32:51Z")
![ERROR - Google Chrome 8_10_2023 6_35_48 PM](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/c/c00f660e3c0084f86855e88c6b57f2526041aa51.png) This is the screenshot ---
**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\ **Post date:** [August 10, 2023, 6:26pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/4 "2023-08-10T18:26:56Z")
Have you had a look in your moonraker.log? You could also post it. From your klippy.log: > mcu ‘mcu’: Starting serial connect > 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’ Did you do [Frequently Asked Questions - Klipper documentation](https://www.klipper3d.org/FAQ.html) Where’s my serial port? Could also be this one [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) Good luck, hcet14 ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 10, 2023, 6:54pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/5 "2023-08-10T18:54:00Z")
So, I did the thing of the Bullseye bug but at the end it still said the thing of No such file or directory when I wrote “ls /dev/serial//by-id/\*” And here is the moonraker.log > **[moonraker.log](https://drive.google.com/file/d/1n2tC_KIbzLjwaXKFDR835qgjOQTMxk6_/view?usp=sharing)** > > Google Drive file. ---
**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\ **Post date:** [August 10, 2023, 7:10pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/6 "2023-08-10T19:10:38Z")
That’s your setup? ![setup](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/9/9e9baba85584eeb9b702654de082f63f9227d5ec.png) ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 10, 2023, 7:37pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/7 "2023-08-10T19:37:03Z")
Yes, but I use mainsail on both depending on the moment and I usually use the laptop for writing commands in linux instead of ssh ---
**Author:** ![LifeOfBrian](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/lifeofbrian/32/2380_2.png) [@LifeOfBrian](https://klipper.discourse.group/u/LifeOfBrian)\ **Post date:** [August 10, 2023, 8:05pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/8 "2023-08-10T20:05:28Z")
You can upload logs directly into your posts. No need for external hoster. ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 10, 2023, 8:18pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/9 "2023-08-10T20:18:26Z")
Yeah, but because it was more than 8mb it didn’t let me ---
**Author:** ![LifeOfBrian](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/lifeofbrian/32/2380_2.png) [@LifeOfBrian](https://klipper.discourse.group/u/LifeOfBrian)\ **Post date:** [August 10, 2023, 8:30pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/10 "2023-08-10T20:30:47Z")
Textfiles can be zipped properly. Just for the next time. ---
**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\ **Post date:** [August 12, 2023, 6:05pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/11 "2023-08-12T18:05:40Z")
> [@KoliyX](#): > > Yes, but I use mainsail on both depending on the moment Are you sure that’s according to Klipper? Does it make sense to use Mainsail also on your host (old laptop with linux mint)? ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 15, 2023, 7:18am UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/12 "2023-08-15T07:18:03Z")
I mean that I have it in the old laptop but to use it I use the web browser in the in the laptop and pc ---
**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 15, 2023, 8:20am UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/13 "2023-08-15T08:20:18Z")
Not sure what the current status is. If the issue still exists, then show the output of: ```auto apt-cache policy udev ``` then: 1. Disconnect the board from the laptop 2. Reconnect it 3. `sudo dmesg > dmesg.txt` and attach the dmesg.txt file here ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 15, 2023, 10:01am UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/14 "2023-08-15T10:01:52Z")
I don’t really understand the part of disconnecting the board, because the laptop alone has the issue, but I still ran what you put and got the file [dmesg.txt](https://klipper.discourse.group/uploads/short-url/s9Zgma2Pyk8hR9Jpi9Uis3MNMMJ.txt) (69.6 KB) ---
**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 15, 2023, 11:16am UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/15 "2023-08-15T11:16:42Z")
Is my understanding correct: - The Laptop is running Linux Mint - Klipper is installed and running on the Laptop - Your printer board is connected to the Laptop via USB ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 15, 2023, 3:25pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/16 "2023-08-15T15:25:00Z")
I mean yes, but since the problem is in the laptop and connecting the printer hasn’t done much I just keep it unpluged till I fix the problem ---
**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 15, 2023, 3:50pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/17 "2023-08-15T15:50:34Z")
To ensure we are on the same page: Do you understand that Klipper requires a continuous connection to the host (e.g., your laptop) to function? The issue does not lie solely with the laptop. If anything, it is a combination of the way the host and the printer board interact. Therefore: 1. Turn on the printer. 2. Connect the printer board to your laptop. 3. Run `sudo dmesg > dmesg.txt` in the command prompt, and then attach the ‘dmesg.txt’ file here. Perform these steps in the exact sequence provided. ---
**Author:** ![KoliyX](https://avatars.discourse-cdn.com/v4/letter/k/8dc957/32.png) [@KoliyX](https://klipper.discourse.group/u/KoliyX)\ **Post date:** [August 15, 2023, 4:19pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/18 "2023-08-15T16:19:13Z")
Okay, so I’ve done what you told me and got the file [dmesg.txt](https://klipper.discourse.group/uploads/short-url/lObZpUjgg3FoxVsL8XH4np35N0.txt) (67.1 KB) ---
**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 15, 2023, 4:25pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/19 "2023-08-15T16:25:30Z")
Follow [Other Single Board Computers (SBC) apart from Raspberry Pis](https://klipper.discourse.group/t/other-single-board-computers-sbc-apart-from-raspberry-pis/6323#potential-pitfalls-4), namely the last point about BRLTTY and ModemManager ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [April 24, 2024, 1:46pm UTC](https://klipper.discourse.group/t/error-with-klipper-connecting-to-moonraker/9873/20 "2024-04-24T13:46:16Z")