---
title: Enable FQDN Check
description: When true, the agent checks whether request URLs match values in FQDN Default and FQDN Virtual Host Map.
component: web-agents
version: 2025.11
page_id: web-agents:properties-reference:com.sun.identity.agents.config.fqdn.check.enable
canonical_url: https://docs.pingidentity.com/web-agents/2025.11/properties-reference/com.sun.identity.agents.config.fqdn.check.enable.html
---

# Enable FQDN Check

When `true`, the agent checks whether request URLs match values in [FQDN Default](com.sun.identity.agents.config.fqdn.default.html) and [FQDN Virtual Host Map](com.sun.identity.agents.config.fqdn.mapping.html).

Use this property to prevent the redirect of requests in the following scenarios:

* Where resource URLs differ from the FQDNs in AM policies, for example, in load balanced and virtual host environments.

* Where hostnames are virtual, allocated dynamically, or match a pattern, for example in a Kubernetes deployment.

* Where hostnames are partial.

If [FQDN Default](com.sun.identity.agents.config.fqdn.default.html) is not set, this property is automatically set to `false`.

Default: `false`

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

|                    |                                                                                  |
| ------------------ | -------------------------------------------------------------------------------- |
| Property name      | `com.sun.identity.agents.config.fqdn.check.enable`   Introduced in Web Agent 4.x |
| Function           | FQDN check                                                                       |
| Type               | Boolean: `true` returns true; all other strings return `false`.                  |
| Bootstrap property | No                                                                               |
| Required property  | No                                                                               |
| Restart required   | No                                                                               |
| AM console         | Tab: `Global`Title: `Enable FQDN Check`                                          |