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NetAlertX/docs/WEB_UI_PORT_DEBUG.md

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# Debugging inaccessible UI
When opening an issue please:
1. Include a screenshot of what you see when accessing `HTTP://<your rpi IP>/20211` (or your custom port)
1. [Follow steps 1, 2, 3, 4 on this page](https://github.com/jokob-sk/NetAlertX/blob/main/docs/DEBUG_TIPS.md)
1. Execute the following in the container to see the processes and their ports and submit a screenshot of the result:
1. `sudo apt-get install lsof`
1. `sudo lsof -i`
1. Try running the `nginx` command in the container
1. if you get `nginx: [emerg] bind() to 0.0.0.0:20211 failed (98: Address in use)` try using a different port number
![lsof ports](/docs/img/WEB_UI_PORT_DEBUG/container_port.png)