---
title: "Radius Server"
description: "If you subscribe\n to PNAC, it is possible to receive a Radius server from HS2N. It is recommended to have at least two radius server in a company, in case one fails."
category: "Port-Based NAC"
subcategory: "Port-Based NAC"
last_updated: "2023-03-31"
source_url: "https://docs.xeox.com/port-based-nac/kfxwencCzErupyXTXVc93F/radius-server/6BzEE4crpawTS2KSNUDqNx"
---

# Radius Server

If you choose to [subscribe](https://docs.xeox.com/administration/wyLDjDBC1xLUFoXLAzdg11) to PNAC, you can receive a radius server from HS2N. It is recommended to have at least two radius servers in a company in case one fails. Larger companies have the option to own more than two. The radius server stores a copy of the CMDB data so that inquiries can also be answered offline in case of internet downtime. A radius server can be responsible for one or multiple sites. When a new site is created, it must be added to the affected radius server by [entering the server on the switch](https://docs.xeox.com/port-based-nac/kfxwencCzErupyXTXVc93F/cisco-sg-and-catalyst-c1300/eKodgbTeKF33WPFcjofqPB).

The heartbeat field on the radius server is crucial as it displays the last synchronization with XEOX. If the last synchronization date was too far back, it is important to check the connection.

![notion image](https://docs.xeox.com/media/00154f56fcacff0d.png)

![notion image](https://docs.xeox.com/media/b3f3e000e32e2b5f.png)

## Email notification

If your radius server stops responding, it is also possible to receive email notifications.

For this purpose add email notification doing the following:

![notion image](https://docs.xeox.com/media/540d0b5faa199477.png)

Select **Notification** and click on + to create a new notification

![notion image](https://docs.xeox.com/media/feb64e4c9e247bac.png)

![notion image](https://docs.xeox.com/media/da4ff12b74000a47.png)

Select your organisation and click **Add** to save.

![notion image](https://docs.xeox.com/media/13d0bab63b40b2cd.png)