Dear All... I was following http://deployingradius.com/documents/configuration/active_directory.html I was installed freeradius-1.1.7 and samba version 3 on my slackware 11 and also I was installed Windows Server 2003 for Active Directory. This is my smb.conf : [global] workgroup = RADIUS security = server password server = radius.satelite.net In this case I'm not using kerberos and I was successfully running my samba and join with my domain. This is about status from my server when I joined root@jadul: net join -U administrator Password: Joined domain RADIUS. And I was successfully to use ntlm_auth helper to authenticate user from my Active Directory. This is the message from my server. root@jadul:/# ntlm_auth --request-nt-key --domain=radius.satelite.net -- username=administrator password: NT_STATUS_OK: Success (0x0) and also I add in the module section on radiusd.conf exec ntlm_auth { wait = yes program = "/path/to/ntlm_auth ntlm_auth --request-nt-key --domain=MYDOMAIN --username=%{mschap:User-Name} --password=%{User-Password}" } and also I add in the users file DEFAULT Auth-Type = ntlm_auth There is no problem when I check with radiusd -X and after I running radiusd. I was check account from my Active Directory using radtest <user_AD> <pass_AD> localhost 1812 testing123 And the result is.. radtest ferdi ferdi localhost 1812 testing123 Sending Access-Request of id 86 to 127.0.0.1 port 1812 User-Name = "ferdi" User-Password = "ferdi" NAS-IP-Address = 255.255.255.255 NAS-Port = 1812 Re-sending Access-Request of id 86 to 127.0.0.1 port 1812 User-Name = "ferdi" User-Password = "ferdi" NAS-IP-Address = 255.255.255.255 NAS-Port = 1812 rad_recv: Access-Reject packet from host 127.0.0.1:1812, id=86, length=20 Why Reject..? Please help me..