？？奇怪代理问题

耶寇

做了个简单代理，可老出现问题，
同一局域网同一网站有些机能访问有些机却不能，但过一会儿那些不能访问的又可以了，没任何限制，怎么会这样呀？？SQUID：

hierarchy_stoplist cgi-bin ?


acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY

auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours


refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern .               0       20%     4320


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 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 777         # multiling http
acl CONNECT method CONNECT


http_access allow manager localhost
http_access deny manager

http_access deny !Safe_ports


http_access allow localhost
http_access allow all
http_access allow all

http_reply_access allow all


icp_access allow all


coredump_dir /var/spool/squid


http_port 8080
http_access allow all
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on