.. _system-using-port-change-radius-authentication:

Changing the Radius Authentication Service Port
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When using a Genian NAC device as a Radius Authentication Server, you can change the port.
The service is provided through the known port 1812, and you can change the port with the following process.

#. Go to **Preferences** in the top panel.
#. Select **RADIUS Server** from the **Service** item on the left.
#. Enter **Authentication Port** in the **Authentication Server** settings.
#. Click the **Update** button.