After I followed this tutorial,

https://doc.pfsense.org/index.php/OpenVPN_with_RADIUS_via_Active_Directory#On_the_Active_Directory_domain_controller

I was still unable to use my windows server 2008 (WS2008) RADIUS in Pfsense and cannot figure out what I have made wrong.

In my pfsense, in System/User Manager/Settings, after Save & test I got this message:

Settings have been saved, but the test was not performed because it is supported only for LDAP based backends.

And tried to auth through Diagnostics/Authentication, with a username and also domain/username from the list of users in the group of WS2008 for RADIUS but still nothing:

The following input errors were detected:
Authentication failed.

In event log there is no entrie about a failed authentication.

If you need any extra info I can provide!

Also both ports from RADIUS are right, compared with what I have in WS2008.