Hi there, I'm trying to setup a Squid 3.3.8 on a Ubuntu 14.04 and I'm having some problems with the NTLM authentication. We have three ports, 2 are with authentication (3128 and 3129). The server is joined to a Windows 2008 domain and authentication works fine on machines that are also in this domain. But on non-domain machines, in Internet Explorer I get the authentication popup up to 6 times, then I get "Access denied" and only after a reload, the site is viewed correctly. With our old Squid 2.7 I just had to login once. I tried to adapt our existing 2.7-config for squid3, maybe I made a mistake, can someone help me to fix this error? Or is this a smb/winbind related error? http_port 3128 http_port 3129 http_port 4711 logformat squid %{%d.%m.%Y %H:%M:%S}tl.%03tu %6tr %>a %[un %Ss/%03>Hs %<st %rm %ru %Sh/%<a %mt hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? no_cache deny QUERY cache_dir ufs /var/cache/squid 100 16 256 cache_access_log stdio:/var/log/squid3/access.log cache_log /var/logs/cache.log cache_log /var/log/squid3/cache.log cache_store_log none emulate_httpd_log on log_fqdn on auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 30 auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880 refresh_pattern . 0 20% 4320 acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 4434 7004 acl Safe_ports port 80 # http acl Safe_ports port 180 # http acl Safe_ports port 181 # http acl Safe_ports port 182 # http acl Safe_ports port 183 # http acl Safe_ports port 184 # http acl Safe_ports port 185 # http acl Safe_ports port 186 # http acl Safe_ports port 187 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT acl firstport myport 3128 # (first local socket TCP port) acl secport myport 3129 # (second local socket TCP port) acl thirdport myport 4711 # (third local socket TCP port) acl SSL method CONNECT always_direct allow SSL http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports acl local-servers dstdomain int.rapunzel.de always_direct allow local-servers acl our_networks_new src 172.16.0.0/16 acl goodlocalips src "/etc/squid3/goodlocalips" http_access allow localhost http_access allow goodlocalips acl AuthorizedUsers proxy_auth REQUIRED http_access allow firstport our_networks_new AuthorizedUsers http_access allow secport our_networks_new AuthorizedUsers http_access allow thirdport http_access deny all always_direct allow all icp_access allow all forwarded_for on never_direct allow all snmp_port 0 coredump_dir /var/cache Thanks and regards Mana Rapunzel Naturkost GmbH, Rapunzelstraße 1, D-87764 Legau Registergericht Memmingen HRB 14736 | Sitz der Gesellschaft: Legau Ust Id Nr. DE 129088402 Geschäftsführer: Joseph Wilhelm | Margit Epple | Andreas Wenning Telefon: +49 (0)8330 / 529 - 0