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pfSense® software can use RADIUS and LDAP servers to authenticate users from remote sources.
Support Throughout pfSense contains information on which areas of the firewall support these servers
To add a new server:
Navigate to System > User Manager, Authentication Servers tab
To edit an existing server, click next to its entry on the same page.
pfSense Hangouts on Youtube to view the August 2015 Hangout on RADIUS and LDAP.
Each type of authentication server is covered in the following documents