Hi, I am using squid2.6stable18 on ubuntu 8.04 server. I have configured squid for very basic proxy and my squid.conf is below. I am not able to access thunderbird email through this proxy configuration, I am using thunderbird from a Ubuntu client, but i am able to access internet using Mozilla Firefox browser, but not thunderbird. How can i get this working? The thunderbird client uses Port 110 and 25 to access emails and i have enabled them here. squid.conf visible_hostname server hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? cache deny QUERY hosts_file /etc/hosts http_port 10.10.10.10:3128 refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 debug_options ALL,9 cache_access_log /var/log/squid/access.log cache_dir null /tmp acl abc urlpath_regex -i\.(mp3|exe|mp4|mov|sex)(\?.*)?$ acl videos dstdomain .youtube.com .yimg.com .orkut.com .sex.com .teen.com .adult.com .mp3.com #cache_mem 256 MB acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 acl Safe_ports port 110 acl Safe_ports port 25 acl Safe_ports port 80 # 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 631 # cups acl Safe_ports port 777 # multiling http acl Safe_ports port 901 # SWAT acl Safe_ports port 993 # IMAP acl Safe_ports port 587 # SMTP acl Safe_ports port 22 # SSH acl purge method PURGE acl special_urls url_regex "/etc/squid/squid-noblock.acl" acl extndeny url_regex -i "/etc/squid/blocks.files.acl" acl malware_block_list url_regex -i "/etc/squid/malware_block_list.txt" acl lan src 192.168.1.0 10.10.10.0/24 acl stud ident_regex babu acl download method GET acl CONNECT method CONNECT ident_lookup_access allow all http_access deny extndeny http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access deny abc http_access deny videos http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access allow special_urls http_access deny extndeny download http_access deny malware_block_list deny_info http://malware.hiperlinks.com.br/denied.shtml malware_block_list http_access allow localhost http_access allow lan http_access deny all http_reply_access allow all icp_access allow all coredump_dir /var/spool/squid Thanks Avinash