---
title: RADIUS authentication module
description: Deprecated. Use PingAM as a RADIUS client to delegate authentication to an external RADIUS server
component: pingam
version: 8
page_id: pingam:radius-server:radius-auth-module
canonical_url: https://docs.pingidentity.com/pingam/8.1/am-authentication/radius-client.html
llms_txt: https://docs.pingidentity.com/pingam/llms.txt
docs_for_agents: https://developer.pingidentity.com/build-with-ai/docs-for-agents.md
revdate: 2026-06-01T14:34:20Z
keywords: ["Radius", "Authentication", "Modules & Chains"]
page_aliases: ["radius-server-guide:radius-auth-module.adoc"]
---

# RADIUS authentication module

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| - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
|   | Authentication modules and chains have been removed in AM 8.0. To continue using the RADIUS authentication module in this release, you must re-enable modules and chains.> **Collapse: Re-enable modules and chains**
>
> 1. Go to Configure > Server Defaults > Advanced in the AM admin UI.
>
> 2. Add the `org.forgerock.am.authentication.chains.enabled` property and set it to `true`.
>
> 3. Save your changes.
>
> 4. Restart AM or the container where it runs.
>
> You can now access modules and chains through the REST endpoints. Modules and chains aren't accessible through the AM admin UI. |

The RADIUS authentication module lets AM act as a RADIUS client, delegating authentication to an external RADIUS server:

![Flows between a user, the authentication module, and an external RADIUS server.](_images/radius-auth-module-flow.svg)Figure 1. RADIUS authentication module: successful authentication flow

Use the RADIUS authentication module when you want AM to pass usernames and passwords through to an external RADIUS server, so that it can authenticate the users.