Thanks Amos but I can’t find a solution : - I’ve installed Squid 3.2.13-1 X64 for fedora 18 (yum install squid) and in the /usr/lib64/squid there is no ext_ldap* files. The only files present in the directory are : - basic_db_auth digest_file_auth - basic_getpwnam_auth digest_ldap_auth - basic_ldap_auth diskd - basic_msnt_auth ext_unix_group_acl - basic_msnt_multi_domain_auth ext_wbinfo_group_acl - basic_ncsa_auth helper-mux.pl - basic_nis_auth log_file_daemon - basic_pam_auth negotiate_kerberos_auth - basic_pop3_auth negotiate_kerberos_auth_test - basic_radius_auth ntlm_fake_auth - basic_sasl_auth ntlm_smb_lm_auth - basic_smb_auth ssl_crtd - basic_smb_auth.sh unlinkd - cachemgr.cgi url_fake_rewrite - digest_edirectory_auth url_fake_rewrite.sh The same seems to be valid for the other version of squid for fedora 18 ; I read the list of files present in the latest version of squid for fedora 18 (link here under) but i don’t see any external ACL helpers called ext_ldap_group_acl. Now I can uninstall squid (rpm –i squid) but then I don’t know what kind of squid version and how can I install it in order to gain access only to the user belonging to a certain AD Group ? http://rpmfind.net//linux/RPM/fedora/18/x86_64/s/squid-3.2.3-3.fc18.x86_64.html http://rpmfind.net//linux/RPM/fedora/devel/rawhide/x86_64/s/squid-3.3.9-1.fc21.x86_64.html As i read in the release notes of squid http://www.squid-cache.org/Versions/v3/3.2/RELEASENOTES.html#ss4.2 the external ACL Helpers squid_ldap_group in the versione 3. The external helpers that replaces the older squid_ldap_group ins’t ext_ldap_group_acl ? I’m sad !! -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Issue-with-Squid-ldap-group-Windows-tp4663221p4663424.html Sent from the Squid - Users mailing list archive at Nabble.com.