# Node Red Mobile Using Termux USB port issue
**URL:** https://discourse.nodered.org/t/node-red-mobile-using-termux-usb-port-issue/67428
**Category:** General
**Created:** [7 September 2022 09:51 UTC](https://discourse.nodered.org/t/node-red-mobile-using-termux-usb-port-issue/67428 "2022-09-07T09:51:32Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Asad.Khan](https://discourse.nodered.org/u/Asad.Khan)
#### Post date: [7 September 2022 09:51 UTC](https://discourse.nodered.org/t/node-red-mobile-using-termux-usb-port-issue/67428/1 "2022-09-07T09:51:32Z")
Hy!
I am using node-red mobile via a termux, I am trying to connect a RFD 868 module to mobile and receive serial data through it via a USBA port. I have connected a USB type C docking station with mobile which have three USB A port.
When I connect the docking station it shows three ports and I have granted access to the ports too via termux api. But when I try to use the port on Nod-red I receive the following message
[error] [serialconfig:29f6efabb67db2b8] serial port /dev/bus/usb/001/003 error: Error: Error: Permission denied, cannot open /dev/bus/usb/001/003
Through same setup on the same port via "free USB serial" app I can receive serial data successfully. But on node-red mobile app its not working. Node red don't ask to select USB port it automatically denied the permission.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [6 November 2022 09:51 UTC](https://discourse.nodered.org/t/node-red-mobile-using-termux-usb-port-issue/67428/2 "2022-11-06T09:51:55Z")
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