# On linux, node red server access a tty device for no reason

**URL:** <https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380>\
**Category:** Hardware\
**Created:** [14 February 2026 21:51 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380 "2026-02-14T21:51:07Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![phil12345678910](https://avatars.discourse-cdn.com/v4/letter/p/b782af/32.png) [@phil12345678910](https://discourse.nodered.org/u/phil12345678910)\
**Post date:** [14 February 2026 21:51 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380/1 "2026-02-14T21:51:07Z")

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Hi,

my installed node red server interfere with a /dev/ttyUSB0 device and I dont want that  
how can I tell nodered server to leave that device alone ?

it is a freshly plugged device and I never configured into nodered

thanks

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [15 February 2026 07:25 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380/2 "2026-02-15T07:25:16Z")

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I'm what way is it interfering with it?

If you search for USB in the editor does it find anything?

Show us the full node red startup log please.

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**Author:** ![phil12345678910](https://avatars.discourse-cdn.com/v4/letter/p/b782af/32.png) [@phil12345678910](https://discourse.nodered.org/u/phil12345678910)\
**Post date:** [15 February 2026 08:32 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380/3 "2026-02-15T08:32:28Z")

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well I use a software on that usb device, and every once in a while that device has a handle from nodered

I want to stop that  
I just installed node red, did not do anything around it  
the only workaround is to disable the server

why is nodered accessing my usb device ? it is a usb lidar, I dont see why nodered would , by default access it

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [15 February 2026 09:57 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380/4 "2026-02-15T09:57:56Z")

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Do you have any flows added to the workspace?

Did you search (`ctrl-f`) for `usb` inside the node-red editor?

Did you install any contrib nodes? (What does palette manager show?)

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [15 February 2026 11:37 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380/5 "2026-02-15T11:37:19Z")

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> [@phil12345678910](#):
>
> every once in a while that device has a handle from nodered

I don't understand what you mean by that.

Also please show us the node red startup log.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [16 April 2026 11:37 UTC](https://discourse.nodered.org/t/on-linux-node-red-server-access-a-tty-device-for-no-reason/100380/6 "2026-04-16T11:37:42Z")

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