> For the complete documentation index, see [llms.txt](https://docs.erathos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.erathos.com/platform/connect-to-databases.md).

# Connect to databases

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Make sure to include our IP address (**35.212.87.86**) to your firewall’s whitelist.
{% endhint %}

To connect to a database—whether as a [source](/platform/connections.md) or a [destination](/destinations/azure-sql-server.md)—you need to ensure that the database is accessible from the **Erathos infrastructure**. To establish this connection:

1. **Firewall Configuration**:
   * Allow the Erathos IP (e.g., **35.212.87.86**) in your database's firewall settings. This step ensures that the infrastructure can reach your database.
2. **Tunneling Credentials**:
   * If the connection requires a tunnel (e.g., SSH or VPN), make sure the tunnel credentials are properly registered on the platform.
   * This involves providing the necessary details such as host, port, username, and private key (if applicable).

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