Hi, I continually have this error inside my /var/log/squid/cache.log: [2010/03/05 12:40:02, 1] libsmb/ntlmssp.c:ntlmssp_update(334) got NTLMSSP command 3, expected 1 And getting a authentication pop up. I found this article about this issue: http://www1.il.squid-cache.org/mail-archive/squid-dev/200906/0041.html This article states that there is a workaround: "The workaround is pretty simple - just enable the IP auth cache." I need to know how to enable my IP auth cache to "workaround" this problem? Please advise me if I'm interpreting this incorrectly? Here is my squid.conf: http_port 0.0.0.0:3128 hierarchy_stoplist cgi-bin ? access_log /var/log/squid/access.log squid cache_log /var/log/squid/cache.log cache_store_log /var/log/squid/store.log dns_nameservers 168.210.2.2 196.14.239.2 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 half_closed_clients off acl manager proto cache_object acl localnet src 172.16.0.0/12 acl localhost src 127.0.0.1 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 acl SSL_ports port 443 21 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https 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 Safe_ports port 89 acl Safe_ports port 119 acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports acl update-micro-dom dstdomain .microsoft.com acl update-micro-dom dstdomain .windowsupdate.com http_access allow update-micro-dom acl cape_town src 172.16.38.0/23 http_access allow cape_town auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp --require-membership-of=S-1-5-21-1070830588-1373467647-793153460-513 auth_param ntlm children 150 auth_param ntlm keep_alive on acl ntlm proxy_auth REQUIRED http_access allow localhost ntlm http_access allow localhost http_reply_access allow all icp_access allow all cache_mgr hbops@xxxxxxxxxxxxxx visible_hostname ZATBIMPROXY01 client_db on acl FTP proto FTP always_direct allow FTP snmp_port 3401 coredump_dir /var/spool/squid Thanks in advance! Regards, Dawie Note: Privileged/Confidential information may be contained in this message and may be subject to legal privilege. Access to this e-mail by anyone other than the intended is unauthorised. If you are not the intended recipient (or responsible for delivery of the message to such person), you may not use, copy, distribute or deliver to anyone this message (or any part of its contents ) or take any action in reliance on it. All reasonable precautions have been taken to ensure no viruses are present in this e-mail. As our company cannot accept responsibility for any loss or damage arising from the use of this e-mail or attachments we recommend that you subject these to your virus checking procedures prior to use. The views, opinions, conclusions and other information expressed in this electronic mail are not given or endorsed by the company unless otherwise indicated by an authorized representative independent of this message.