---
title: "Polarity General Server v5 - Configure the Server FQDN"
slug: "polarity-configure-the-server-fqdn"
description: "In Polarity General Server v5 you can set or change the server's fully qualified domain name (FQDN). Edit the /app/.env file, update POLARITY_HOSTNAME and POLARITY_WEB_HOSTNAME."
updated: 2024-12-23T21:27:03Z
published: 2024-12-23T21:27:03Z
canonical: "knowledge.threatconnect.com/polarity-configure-the-server-fqdn"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://knowledge.threatconnect.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Configure the Server FQDN

*Set the server's FQDN if the hostname does not match.*

## Update FQDN in Polarity Config

By default the Polarity Server will assume the FQDN (fully qualified domain name) for your server matches the hostname set on it. **If this is not the case**, you will need to modify the Polarity Server environment file to set the appropriate hostname.

To modify the Polarity server environment file begin by opening the /app/.env file for editing.

Find the variables POLARITY_HOSTNAME and POLARITY_WEB_HOSTNAME. Set these to the FQDN of your Polarity Server. This can also set this to an IP address.

```actionscript
POLARITY_HOSTNAME=your.fqdn.com
POLARITY_WEB_HOSTNAME=your.fqdn.com
```

Save the change and close the file.

Restart the Polarity Server containers:

```actionscript
cd /app && ./down.sh && ./up.sh
```

Your FQDN should now be set, which will ensure that all REST API generated links are correct.