To configure RADIUS authentication

1. In the configuration utility, on the Configuration tab, expand Citrix Gateway > Policies > Authentication.
2. Click RADIUS, and then in the details pane, on the Policies tab, click Add .
3. In the Create Authentication Policy dialog box, in Name, type a name for the policy.
4. In Name, type a name for the policy.
5. Next to Server, click New.
6. In the Create Authentication Policy dialog box, in Name, type a name for the server.
7. Under Server, in IP Address, type the IP address of the RADIUS server.
8. In Port, type the port. The default is 1812.
9. Under Details, in Secret Key and Confirm Secret Key, type the RADIUS server secret.
10. In NAS ID, type the identifier number and then click Create.
11. In the Create Authentication Policy dialog box, next to Named Expressions, select the expression, click Add Expression, click Create and then click Close.