> For the complete documentation index, see [llms.txt](https://docs.uibakery.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.uibakery.io/on-premise/install-and-update/troubleshooting.md).

# Troubleshooting installation errors

Common installation errors

## \[::]:3030 failed (97: Address family not supported by protocol...

When installing or starting the server, you might encounter an error related to Nginx, as shown below:

```plaintext
1#1: socket() [::]:3030 failed (97: Address family not supported by protocol)
socket() [::]:3030 failed (97: Address family not supported by protocol)
```

This error indicates a problem with Nginx attempting to open a socket on an IPv6 address, which might not be supported in your network configuration.

### Solution

1. Open UI Bakery `.env` ([Updating UI Bakery ENV variables guide](/on-premise/install-and-update/updating-environment-variables.md))
2. Add or update the following line:

```sh
UI_BAKERY_LISTEN_IP6=false
```

3. Save the file and restart UI Bakery

```sh
docker compose down
docker compose up -d
```

## Escaping special characters

Sometimes when using special characters in your environment variables, like &, $, %, the variables may not be escaped properly. To fix it, put the variable value in quotes like this:

```bash
UI_BAKERY_SMTP_PASSWORD='myPasswordWithSpecicalChars$33%#4'
```

{% hint style="info" %}
If you have an older version of Docker installed, you may need to use **double quotes** instead.
{% endhint %}


---

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