Yohoo! Yes! I did it! ;) My freeradius (1.0.1-1.RHEL3) authenticates again our ActiveDirectory (on 2003 Server). Without ntlm_auth! Below I have added a short summary how I realized it here. But now I have a question and I can't solve it for myself. I want to retreive some group informations from AD. In an users account I find several values "memberOf" and the DN of the group, where the user belong to. Now I want to give access via freeradius only to some special groups. I have figuered out, that there are these parameters: groupname_attribute, groupmembership_filter and groupmembership_attribute combined with some entries in the users-file. I've read the doc/rlm_ldap, but I didn't find any deeper hints or explanation. Questions: 1. Where can I find some docs about the %{...} Values in groupmebership_filter? Which one should I use in combination with my AD? 2. Which value should I use then in the users-file? 3. Is there anyone who can give a little help in further authenticating with group? -------------short summary how to authenticate vs. ActiveDirectory ----------------------- /etc/raddb/radiusd.conf [...] ldap { #servername with an AD-Server running Win2003Srv server = "adsrv.qsc.de" #The Useraccount for querying AD (anonymous query is disabled) identity = "cn=man,ou=ServiceAdmins,dc=qsc,dc=de" #The password for the Query-User password = 'xxxxxx' #base DN for user search; all our Users are in ou=employees. Without this "ou=...", no user will be found. \ #I don't understand why basedn = "ou=employees,dc=qsc,dc=de" # I've copied the below string, because I didn't understand the meanings of the %{...} filter = "(sAMAccountname=%{Stripped-User-Name:-%{User-Name}})" # I had to increase the timeouts timeout = 40 timelimit = 30 net_timeout = 10 } The users-file left on default, no changes. I hope, I could help some people trying to use AD for radius. And, I hope, someone will help me with my user-problem. Greets Christian