我有一台 ubuntu 11.10 机器。安装 Squid3。当我将 squid 配置为 http_access allow all 时，一切正常。我目前的配置大多默认如下：
2012/09/10 13:19:57| Processing Configuration File: /etc/squid3/squid.conf (depth 0)
2012/09/10 13:19:57| Processing: acl manager proto cache_object
2012/09/10 13:19:57| Processing: acl localhost src 127.0.0.1/32 ::1
2012/09/10 13:19:57| Processing: acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
2012/09/10 13:19:57| Processing: acl SSL_ports port 443
2012/09/10 13:19:57| Processing: acl Safe_ports port 80 # http
2012/09/10 13:19:57| Processing: acl Safe_ports port 21 # ftp
2012/09/10 13:19:57| Processing: acl Safe_ports port 443 # https
2012/09/10 13:19:57| Processing: acl Safe_ports port 70 # gopher
2012/09/10 13:19:57| Processing: acl Safe_ports port 210 # wais
2012/09/10 13:19:57| Processing: acl Safe_ports port 1025-65535 # unregistered ports
2012/09/10 13:19:57| Processing: acl Safe_ports port 280 # http-mgmt
2012/09/10 13:19:57| Processing: acl Safe_ports port 488 # gss-http
2012/09/10 13:19:57| Processing: acl Safe_ports port 591 # filemaker
2012/09/10 13:19:57| Processing: acl Safe_ports port 777 # multiling http
2012/09/10 13:19:57| Processing: acl CONNECT method CONNECT
2012/09/10 13:19:57| Processing: http_access allow manager localhost
2012/09/10 13:19:57| Processing: http_access deny manager
2012/09/10 13:19:57| Processing: http_access deny !Safe_ports
2012/09/10 13:19:57| Processing: http_access deny CONNECT !SSL_ports
2012/09/10 13:19:57| Processing: http_access allow localhost
2012/09/10 13:19:57| Processing: http_access deny all
2012/09/10 13:19:57| Processing: http_port 3128
2012/09/10 13:19:57| Processing: coredump_dir /var/spool/squid3
2012/09/10 13:19:57| Processing: refresh_pattern ^ftp: 1440 20% 10080
2012/09/10 13:19:57| Processing: refresh_pattern ^gopher: 1440 0% 1440
2012/09/10 13:19:57| Processing: refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
2012/09/10 13:19:57| Processing: refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
2012/09/10 13:19:57| Processing: refresh_pattern . 0 20% 4320
2012/09/10 13:19:57| Processing: http_access allow all
2012/09/10 13:19:57| Processing: cache_mem 512 MB
2012/09/10 13:19:57| Processing: logformat squid3 %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru
2012/09/10 13:19:57| Processing: access_log /home/panshul/squidCache/log/access.log squid3
当我启用以下行时，问题就开始了：
access_log /home/panshul/squidCache/log/access.log
我开始进入proxy server is refusing connections error浏览器。在我的配置中注释掉上述行后，一切恢复正常。
当我将以下行添加到我的配置时，第二个问题开始了：
cache_dir ufs /home/panshul/squidCache/cache 100 16 256
squid 服务器无法启动。
任何建议我在配置中缺少什么。请帮忙。！！