Hi Alan, Configure reports the below – is doesn’t say which it’s using afaics:. === configuring in src/modules/rlm_ldap (/home/andy/freeradius-server/src/modules/rlm_ldap) checking for ldap_init in -lldap... yes checking for ldap.h... yes checking for ldap_sasl_interactive_bind... yes checking for ldap_unbind_ext_s... yes checking for ldap_start_tls_s... yes checking for ldap_initialize... yes checking for ldap_set_rebind_proc... yes checking for ldap_create_sort_control... yes checking for ldap_create_sort_keylist... yes checking for ldap_free_sort_keylist... yes checking for ldap_create_session_tracking_control... yes checking for ldap_url_parse... yes checking for ldap_is_ldap_url... yes checking for ldap_url_desc2str... yes checking whether ldap_create_session_tracking_control is declared... no checking whether ldap_set_rebind_proc takes 3 arguments... 3 .. however I don’t have any nss specific named dev libraries installed, but do have libldap2-dev:amd64 which apt-cache says is openldap : Description-en: OpenLDAP development libraries This package allows development of LDAP applications using the OpenLDAP libraries. It includes headers, libraries and links to allow static and dynamic linking. .. so I guess it’s openldap. Thanks Andy From: Alan Buxey [mailto:A.L.M.Buxey@lboro.ac.uk] Sent: 10 May 2016 18:50 To: FreeRadius users mailing list; Franks Andy (IT Technical Architecture Manager); 'freeradius-users@lists.freeradius.org' Subject: Re: Ldap searches don't seem to honour connect_timeout I've seen some ldap behaviour in similar vein but am currently side tracked by other issues - what I've seen is ldap working but then after some time ldap searches no longer working though the connection settings are to keep connections open and not close. Firstly though, your ldap is compiled with openssl and not NSS, right? alan