# Radius Server Settings

Remote Authentication Dial-In User Service (RADIUS) is a client/server protocol. RADIUS is used to enable communication between a remote access server and a central server to authenticate and authorize dial-in users and grant them access to the required system or service.

## How to Configure Radius Server Settings?

To configure radius server settings, go to **Settings** -> **General Settings** -> **Authentication** -> **Radius Server Settings** and enter the required details:

![Radius server settings in OpManager: Add credentials page](https://www.manageengine.com/network-monitoring/help/images/radius.png)

1. **Server IP:** Enter the IP of the server where the radius server is running.
2. **Authentication Port:** Port in which the server is running it (Normally 1812).
3. **Server Secret:** Its the master password with which the details of the user configured in the radius server are retrieved.
4. **Protocol:** Select the desired protocol from the list - PAP/CHAP/MSCHAP/MSCHAP2. This should be the protocol that the radius server uses for communication.
5. **Authentications Retries:** Choose the amount of times that OpManager should retry if there is a connection issue.
6. Click on '**Save**'.

To know more about OpManager's Authentication methods, explore the following help documents.

- [AD Domain](https://www.manageengine.com/network-monitoring/help/add-domain.html)
- [Two-factor authentication](https://www.manageengine.com/network-monitoring/help/two-factor-authentication.html)
- [SAML authentication](https://www.manageengine.com/network-monitoring/help/saml-help.html)
- [Oauth authentication](https://www.manageengine.com/network-monitoring/help/oauth-authentication.html)