# Radius Server
RADIUS proxy servers are used for centralized administration. Remote Authentication Dial in User Service (RADIUS) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users that connect and use a network service for greater convenience. RADIUS is a server protocol that runs in the application layer, using UDP as transport. The Network switch with port-based authentication and all have a RADIUS client component that communicates with the RADIUS server. Clients connected to a port on the switch must be authenticated by the Authentication server before accessing services offered by the switch on the LAN. Use a RADIUS server to authenticate users trying to access a network by relaying Extensible Authentication Protocol over LAN (EAPOL) packets between the client and server. The RADIUS server maintains a user database, which contains authentication information. The switch passes information to the configured RADIUS server, which can authenticate a username and password before authorizing use of the network.
| Items | Description |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| Index | Displays the index for which RADIUS server is displayed. |
| Server IP | Enter the RADIUS server IP address. |
| Authorized Port | Enter the authorized port number. The default port is 1812. |
| Accounting Port | Enter the name you wish to use to identify this switch. |
| Key String | Enter the key string used for encrypting all RADIUS communication between the device and the RADIUS server. |
| Timeout Reply | Enter the amount of time the device waits for an answer from the RADIUS server before switching to the next server. The default value is 3. |
| Retry | Enter the number of transmitted requests sent to the RADIUS server before a failure occurs. The default is 3. |
| Server Priority | Enter the priority for the RADIUS server. |
| Dead Timeout | Enter the amount of time that the RADIUS server is bypassed for service requests. The default value is 0. |
Click the **Apply** button  to accept the changes or the **Cancel** button  to discard them.
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