Hi There, I'm using squid 3.1.10 and have a problem with authentication. It work on my prevois version but on the my new Centos 6.2 it just don't want to. Please see below error. Starting squid: [FAILED] 2012/01/25 16:50:12| Processing Configuration File: /etc/squid/squid.conf (depth 0) 2012/01/25 16:50:12| Can't use proxy auth because no authentication schemes are fully configured. FATAL: ERROR: Invalid ACL: acl authenticate proxy_auth REQUIRED Squid Cache (Version 3.1.10): Terminated abnormally. CPU Usage: 0.004 seconds = 0.002 user + 0.002 sys Maximum Resident Size: 19056 KB Page faults with physical i/o: 0 Here with my squid conf file. # # Recommended minimum configuration: # acl manager proto cache_object #acl localhost src 127.0.0.1/32 ::1 #acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 # Example rule allowing access from your local networks. # Adapt to list your (internal) IP networks from where browsing # should be allowed #acl localnet src 10.0.0.0/8 # RFC1918 possible internal network #acl localnet src 192.168.0.0/16 # RFC1918 possible internal network #acl localnet src fc00::/7 # RFC 4193 local private network range #acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines acl SSL_ports port 443 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 777 # multiling http acl purge method PURGE acl CONNECT method CONNECT acl localnet src 192.168.15.0/24 acl to_localnet dst 192.168.15.0/24 acl authenticate proxy_auth REQUIRED acl CONNECT method CONNECT # # Recommended minimum Access Permission configuration: # # Only allow cachemgr access from localhost http_access allow manager localhost http_access deny manager # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # We strongly recommend the following be uncommented to protect innocent # web applications running on the proxy server who think the only # one who can access services on "localhost" is a local user #http_access deny to_localhost # # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS # # Example rule allowing access from your local networks. # Adapt localnet in the ACL section to list your (internal) IP networks # from where browsing should be allowed http_access allow localnet http_access allow localhost # And finally deny all other access to this proxy http_access deny all # Squid normally listens to port 3128 http_port 192.168.15.15:3128 # We recommend you to use at least the following line. hierarchy_stoplist cgi-bin ? # Uncomment and adjust the following to add a disk cache directory. #cache_dir ufs /var/spool/squid 100 16 256 # Leave coredumps in the first cache dir coredump_dir /var/spool/squid # Add any of your own refresh_pattern entries above these. refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 Please help... Thanks Andrew