Although I can query an AD server via ldapsearch without problems, I do not get it working using freeradiusd. I do get rlm_ldap: search failed. In the logs first I see: rlm_ldap: Bind was successful later there is: ... ldap_chase_referrals^M read1msg: V2 referral chased, mark request completed, id = 3^M new result: res_errno: 1, res_error: <00000000: LdapErr: DSID-0C090627, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, vece>, res_matched: <>^M Why can this happen? (complete log at: http://www.wegener-net.de/fr ) raidusd.conf is also there My radiusd.conf includes the section: ldap ldap1 { server = "tde002.sitest.net" identity = "testrad@TDE002.SITEST.NET" password = "mypass" basedn = "dc=TDE002,dc=SITEST,dc=NET" filter="(servicePrincipalName=HOST/lnxad)" # a fixed value here, just for testing. This filter works with ldapsearch. ldap_debug=0xFFFF #base_filter = "(objectclass=computer)" ldap_connections_number = 1 timeout = 40 timelimit = 30 net_timeout = 10 tls { start_tls = no } dictionary_mapping = ${raddbdir}/ldap.attrmap } Any hint is appreciated. Thanks Norbert Wegener