# mosquitto Error: Address already in use

**URL:** https://dietpi.com/forum/t/mosquitto-error-address-already-in-use/5130
**Category:** Troubleshooting
**Created:** [18 March 2021 20:34 UTC](https://dietpi.com/forum/t/mosquitto-error-address-already-in-use/5130 "2021-03-18T20:34:27Z")
**Posts on this page:** 1
**Showing post:** 2

<div class="post-metadata">

### Author: ![Joulinar](https://dietpi.com/forum/user_avatar/dietpi.com/joulinar/32/57_2.png) [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [18 March 2021 20:36 UTC](https://dietpi.com/forum/t/mosquitto-error-address-already-in-use/5130/2 "2021-03-18T20:36:05Z")

</div>

you can run following to check which ports are in use and by which application

```nohighlight
ss -tulpn | grep LISTEN

```

as well you might be impacted by this [https://dietpi.com/forum/t/7-0-2-upgrade-mosquitto-doesnt-appear-to-work/5122/1](https://dietpi.com/forum/t/7-0-2-upgrade-mosquitto-doesnt-appear-to-work/5122/1)  
because I see following on your output

```nohighlight
Starting in local only mode. Connections will only be possible from clients running on this machine.

```

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