# Modbus TCP Server on port 502

**URL:** <https://discourse.nodered.org/t/modbus-tcp-server-on-port-502/4760>\
**Category:** General\
**Created:** [10 November 2018 21:47 UTC](https://discourse.nodered.org/t/modbus-tcp-server-on-port-502/4760 "2018-11-10T21:47:05Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![thatcadguy](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/thatcadguy/32/5273_2.png) [@thatcadguy](https://discourse.nodered.org/u/thatcadguy)\
**Post date:** [19 January 2019 05:22 UTC](https://discourse.nodered.org/t/modbus-tcp-server-on-port-502/4760/3 "2019-01-19T05:22:31Z")

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Not to bump an old thread, but for anyone who comes searching, the most likely culprit is needing root access to listen on a port less than 1024, assuming you're running Node-RED on a Linux device.

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_[View the full topic](https://discourse.nodered.org/t/modbus-tcp-server-on-port-502/4760)._