# \[Resolved\] Cannot find Arduino port in Serial In or Serial Out nodes

**URL:** https://discourse.nodered.org/t/resolved-cannot-find-arduino-port-in-serial-in-or-serial-out-nodes/34916
**Category:** General
**Created:** [27 October 2020 22:04 UTC](https://discourse.nodered.org/t/resolved-cannot-find-arduino-port-in-serial-in-or-serial-out-nodes/34916 "2020-10-27T22:04:59Z")
**Posts on this page:** 1
**Showing post:** 6

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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: [27 October 2020 22:34 UTC](https://discourse.nodered.org/t/resolved-cannot-find-arduino-port-in-serial-in-or-serial-out-nodes/34916/6 "2020-10-27T22:34:50Z")

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> [@Huda](#):
>
> I made sure that the serial monitor is closed before running Node Red

Could it be still hanging onto the port.

A sure fire way is to reboot PC & try again.

Failing that, perhaps there was an issue compiling the serial port code for Windows 10 when you installed node-red or a node that installs serial?

Did / do you have windows-build-tools installed?

```auto
npm install --global windows-build-tools

```

if not - then you might need to install that then install serial port again

see this similar thread [Error while lauching Node-Red: "It looks like serialport didn't compile properly. This is a common problem and its fix is well documented here https://github.com/voodootikigod/node-serialport#to-install" - #3 by Jasurf](https://discourse.nodered.org/t/error-while-lauching-node-red-it-looks-like-serialport-didnt-compile-properly-this-is-a-common-problem-and-its-fix-is-well-documented-here-https-github-com-voodootikigod-node-serialport-to-install/11395/3)

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