---
title: FQDN Default
description: The default FQDN to access resources. Set this property during agent installation, and change it only if necessary. Without this value, the web server can fail to start.
component: web-agents
version: 2025.11
page_id: web-agents:properties-reference:com.sun.identity.agents.config.fqdn.default
canonical_url: https://docs.pingidentity.com/web-agents/2025.11/properties-reference/com.sun.identity.agents.config.fqdn.default.html
---

# FQDN Default

The default FQDN to access resources. Set this property during agent installation, and change it only if necessary. Without this value, the web server can fail to start.

This property requires [Enable FQDN Check](com.sun.identity.agents.config.fqdn.check.enable.html) to be `true`.

|   |                                                                                                                               |
| - | ----------------------------------------------------------------------------------------------------------------------------- |
|   | If you specify an FQDN in this property, also add it to the [Agent Root URL for CDSSO](sunIdentityServerDeviceKeyValue.html). |

Learn more in [FQDN checks](../user-guide/fqdn-checking.html) in the *User Guide*.

|                    |                                                                             |
| ------------------ | --------------------------------------------------------------------------- |
| Property name      | `com.sun.identity.agents.config.fqdn.default`   Introduced in Web Agent 4.x |
| Function           | FQDN check                                                                  |
| Type               | String                                                                      |
| Bootstrap property | No                                                                          |
| Required property  | No                                                                          |
| Restart required   | No                                                                          |
| AM console         | Tab: `Global`Title: `FQDN Default`                                          |