# Failed to autodetect serial port **URL:** \ **Category:** LulzBot Mini\ **Created:** [January 10, 2017, 7:31am UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428 "2017-01-10T07:31:29Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![gordon\_uw](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gordon\_uw](https://forum.lulzbot.com/u/gordon_uw)\ **Post date:** [January 10, 2017, 7:31am UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428/1 "2017-01-10T07:31:29Z")
I am having difficulty with Windows10 connecting to Lulzbot Mini. I have the same issue on two different machines, both Windows 10 (though the error is with different ports on either machine). In Cura I am able to click on Control, which brings up the Control menu. However at this point it fails to connect with the error. I click on the Connect button and it reinforces that there is an error: \_Changing monitoring state from ‘Offline’ to ‘Opening serial port’ Connecting to: COM3 with baudrate: 115200 (configured) Unexpected error while connecting to serial port: COM3 ValueError: ‘Cannot configure port, some setting was wrong. Original message: WindowsError(31, ‘A device attached to the system is not functioning.’)’ @ machineCom.py:_monitor:357 Found no ports to try for auto detection Changing monitoring state from ‘Opening serial port’ to ‘Error: Failed to autodetect serial port.’_ I have tried to set the COM port manually as well as set the baudrate to AUTO as well as 9600. Nothing seems to work. I have verified that the drivers are installed. Does anyone have any ideas of what I can try? Thanks in advance, -Gordon ---
**Author:** ![nopick](https://avatars.discourse-cdn.com/v4/letter/n/7bcc69/32.png) [@nopick](https://forum.lulzbot.com/u/nopick)\ **Post date:** [January 10, 2017, 2:38pm UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428/2 "2017-01-10T14:38:54Z")
Does the printer show up in Windows device manager when you connect the USB cable? ---
**Author:** ![gordon\_uw](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gordon\_uw](https://forum.lulzbot.com/u/gordon_uw)\ **Post date:** [January 11, 2017, 6:18am UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428/3 "2017-01-11T06:18:41Z")
In Device Manager the only thing I see when the device is plugged in via USB is “Ports -\> 3D Printer powered by Rambo”. I reinstalled the Cura software. I don’t see any other drivers installed and there doesn’t appear to be any errors. The situation, however, is a bit more complicated. I was able to connect to the printer briefly. After multiple attempts I was able to update the Firmware to the very latest, however most attempts failed with a ‘Timeout’ about halfway through. Don’t ask why I tried to flash the Firmware. I have the impression that the USB connection is fickle. As I wiggled the USB cable it seemed to have more success connecting. I tried a different USB cord which initially appeared to have better success, but that was short lived. The whole USB connection may simply be a red herring, but if it is not I suspect that it is on the board itself. I was able to start a print job, however it was interrupted due to an error with the Print Head not being cleaned. Since then I have not been able to reconnect to the printer. Do you know if any command-line or utilities I can run to get a better idea of what the issue may be? Thanks! ---
**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\ **Post date:** [January 11, 2017, 6:38am UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428/4 "2017-01-11T06:38:51Z")
Did you clean your print head with a wire brush while the printer was on by any chance? ---
**Author:** ![gordon\_uw](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gordon\_uw](https://forum.lulzbot.com/u/gordon_uw)\ **Post date:** [January 12, 2017, 1:29am UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428/5 "2017-01-12T01:29:19Z")
No. I am a bit of a newbie at this so I just let the print head clean itself. Still unable to get the printer to communicate with computer. ---
**Author:** ![gordon\_uw](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gordon\_uw](https://forum.lulzbot.com/u/gordon_uw)\ **Post date:** [January 14, 2017, 1:44am UTC](https://forum.lulzbot.com/t/failed-to-autodetect-serial-port/4428/6 "2017-01-14T01:44:26Z")
Update…I contacted support and they suggested to update to the latest version of Cura which must have been released fairly recently. So far things seem to work. I am keeping my fingers crossed.