# Inserting serial port doesn't work

**URL:** <https://discourse.nodered.org/t/inserting-serial-port-doesnt-work/39004>\
**Category:** General\
**Created:** [12 January 2021 14:17 UTC](https://discourse.nodered.org/t/inserting-serial-port-doesnt-work/39004 "2021-01-12T14:17:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Tehn](https://avatars.discourse-cdn.com/v4/letter/t/51bf81/32.png) [@Tehn](https://discourse.nodered.org/u/Tehn)\
**Post date:** [12 January 2021 14:17 UTC](https://discourse.nodered.org/t/inserting-serial-port-doesnt-work/39004/1 "2021-01-12T14:17:07Z")

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Hello! while trying to import data from a port i keep getting acces denied in the following line  
12 Jan 15:15:43 - [error] serial port COM4 error: Error: Opening COM4: Access denied  
Does anyone know how to read the COM port in a way it doesnt get denied

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [12 January 2021 14:56 UTC](https://discourse.nodered.org/t/inserting-serial-port-doesnt-work/39004/2 "2021-01-12T14:56:45Z")

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is something else (another application) already using it ? only one app can talk to it at one time. Does your user have access (is it part of the dialout group (if a linux user)) - etc.

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**Author:** ![Tehn](https://avatars.discourse-cdn.com/v4/letter/t/51bf81/32.png) [@Tehn](https://discourse.nodered.org/u/Tehn)\
**Post date:** [12 January 2021 15:03 UTC](https://discourse.nodered.org/t/inserting-serial-port-doesnt-work/39004/3 "2021-01-12T15:03:36Z")

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Thank you, this solved it!

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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:** [26 January 2021 15:04 UTC](https://discourse.nodered.org/t/inserting-serial-port-doesnt-work/39004/4 "2021-01-26T15:04:00Z")

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Closed on 26 January 2021 15:04 UTC

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