我对 squid3 有一个奇怪的问题。它正常工作，我可以通过代理访问大多数网站。但是有些网站喜欢
google.com
bing.com
只是似乎被阻止但并非总是如此。重新启动 squid3 似乎没有帮助或清除 /var/spool/squid3 （缓存）目录。
如果我登录到运行 squid3 的机器并且
wget --no-proxy google.com
那么没有问题但是如果我通过代理它永远不会响应。大多数其他网站都可以访问，包括我目前通过代理使用的 stackoverflow.com。知道 google.com 和 bing.com 可能有什么特别之处，以便 squid3 以不同的方式对待它们，并且 squid3 conf 文件中是否有任何可能与此类行为相关的设置。
我也有同样的问题。我的问题是由 ipv6 连接问题引起的。Squid3 支持 ipv6 和 ipv4 协议。如果您的服务器无法连接 ipv6 并且远程服务器更喜欢 ipv6，那么 squid 也更喜欢 ipv6 并且无法检索访问日志等数据。
首先尝试使用 ping 连接 ipv6。
ping6 ivp6.google.com
如果 ping 没有响应，让我们先将 squid3 配置为首选 ipv4。
在 squid.conf 中搜索
TAG: dns_v4_first
后
#Default:
#dns_v4_first off
添加
dns_v4_first on
然后重启squid3服务器
service squid3 restart
这是我修复前的访问日志。
1352760882.854 796 88.my.ip.108 TCP_MISS/000 0 GET http://connect.facebook.net/en_US/all.js [squiduser] DIRECT/connect.facebook.net -
1352760885.717 69 88.my.ip.108 TCP_MISS/000 0 GET http://www.google.com.tr/complete/search? [squiduser] DIRECT/www.google.com.tr -
1352760886.250 13 88.my.ip.108 TCP_MISS/000 0 GET http://www.google.com.tr/complete/search? [squiduser] DIRECT/www.google.com.tr -
1352760887.011 369 88.my.ip.108 TCP_MISS/000 0 GET http://www.google.com.tr/complete/search? [squiduser] DIRECT/www.google.com.tr -
1352760887.989 42 88.my.ip.108 TCP_MISS/000 0 GET http://www.google.com.tr/complete/search? [squiduser] DIRECT/www.google.com.tr -
1352760888.984 75 88.my.ip.108 TCP_MISS/000 0 GET http://www.google.com.tr/complete/search? [squiduser] DIRECT/www.google.com.tr -
1352760897.351 8165 88.my.ip.108 TCP_MISS/000 0 GET http://www.google.com.tr/search? [squiduser] DIRECT/www.google.com.tr -
1352761072.531 10970 88.my.ip.108 TCP_MISS/000 0 GET http://www.google-analytics.com/__utm.gif? [squiduser] DIRECT/www.google-analytics.com -
1352761072.533 10272 88.my.ip.108 TCP_MISS/000 0 GET http://apis.google.com/js/plusone.js [squiduser] DIRECT/apis.google.com -
1352761072.535 10262 88.my.ip.108 TCP_MISS/000 0 GET http://connect.facebook.net/en_US/all.js [squiduser] DIRECT/connect.facebook.net -
这是我的完整鱿鱼配置。我使用 squid 作为匿名代理服务器。
2012/11/14 00:09:02| Processing Configuration File: /etc/squid3/squid.conf (depth 0)
2012/11/14 00:09:02| Processing: auth_param basic program /usr/lib/squid3/ncsa_auth /etc/squid3/squid.passwd
2012/11/14 00:09:02| Processing: auth_param basic children 5
2012/11/14 00:09:02| Processing: auth_param basic realm Squid proxy-caching web server
2012/11/14 00:09:02| Processing: auth_param basic credentialsttl 2 hours
2012/11/14 00:09:02| Processing: acl manager proto cache_object
2012/11/14 00:09:02| Processing: acl localhost src 127.0.0.1/32 ::1
2012/11/14 00:09:02| Processing: acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
2012/11/14 00:09:02| Processing: acl CONNECT method CONNECT
2012/11/14 00:09:02| Processing: http_access allow manager localhost
2012/11/14 00:09:02| Processing: http_access deny manager
2012/11/14 00:09:02| Processing: http_access allow localhost
2012/11/14 00:09:02| Processing: acl ncsaauth proxy_auth REQUIRED
2012/11/14 00:09:02| Processing: http_access allow ncsaauth
2012/11/14 00:09:02| Processing: http_access deny all
2012/11/14 00:09:02| Processing: http_port 8880
2012/11/14 00:09:02| Processing: coredump_dir /var/spool/squid3
2012/11/14 00:09:02| Processing: refresh_pattern ^ftp: 1440 20% 10080
2012/11/14 00:09:02| Processing: refresh_pattern ^gopher: 1440 0% 1440
2012/11/14 00:09:02| Processing: refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
2012/11/14 00:09:02| Processing: refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
2012/11/14 00:09:02| Processing: refresh_pattern . 0 20% 4320
2012/11/14 00:09:02| Processing: dns_v4_first on
2012/11/14 00:09:02| Processing: forwarded_for delete
2012/11/14 00:09:02| Processing: request_header_access Allow allow all
2012/11/14 00:09:02| Processing: request_header_access Authorization allow all
2012/11/14 00:09:02| Processing: request_header_access WWW-Authenticate allow all
2012/11/14 00:09:02| Processing: request_header_access Proxy-Authorization allow all
2012/11/14 00:09:02| Processing: request_header_access Proxy-Authenticate allow all
2012/11/14 00:09:02| Processing: request_header_access Cache-Control allow all
2012/11/14 00:09:02| Processing: request_header_access Content-Encoding allow all
2012/11/14 00:09:02| Processing: request_header_access Content-Length allow all
2012/11/14 00:09:02| Processing: request_header_access Content-Type allow all
2012/11/14 00:09:02| Processing: request_header_access Date allow all
2012/11/14 00:09:02| Processing: request_header_access Expires allow all
2012/11/14 00:09:02| Processing: request_header_access Host allow all
2012/11/14 00:09:02| Processing: request_header_access If-Modified-Since allow all
2012/11/14 00:09:02| Processing: request_header_access Last-Modified allow all
2012/11/14 00:09:02| Processing: request_header_access Location allow all
2012/11/14 00:09:02| Processing: request_header_access Pragma allow all
2012/11/14 00:09:02| Processing: request_header_access Accept allow all
2012/11/14 00:09:02| Processing: request_header_access Accept-Charset allow all
2012/11/14 00:09:02| Processing: request_header_access Accept-Encoding allow all
2012/11/14 00:09:02| Processing: request_header_access Accept-Language allow all
2012/11/14 00:09:02| Processing: request_header_access Content-Language allow all
2012/11/14 00:09:02| Processing: request_header_access Mime-Version allow all
2012/11/14 00:09:02| Processing: request_header_access Retry-After allow all
2012/11/14 00:09:02| Processing: request_header_access Title allow all
2012/11/14 00:09:02| Processing: request_header_access Connection allow all
2012/11/14 00:09:02| Processing: request_header_access Proxy-Connection allow all
2012/11/14 00:09:02| Processing: request_header_access User-Agent allow all
2012/11/14 00:09:02| Processing: request_header_access Cookie allow all
2012/11/14 00:09:02| Processing: request_header_access All deny all
请记住，dns_v4_first on 仅适用于较新的 squid3 版本。例如，如果你运行一个 debian6 服务器，你有 squid3-3.1.6，它没有这个配置开关。
对于那些旧版本，您必须编辑配置行
tcp_outgoing_address SERVERIP all
其中 SERVERIP 是您的服务器的 IP。