Hi mr Amos , ive installed libcap2 already in centos 6.3 [root@squid ~]# yum install libcap Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile * base: ftp.hosteurope.de * extras: ftp.hosteurope.de * updates: ftp.hosteurope.de base | 3.7 kB 00:00 extras | 3.5 kB 00:00 updates | 3.5 kB 00:00 Setting up Install Process Package libcap-2.16-5.5.el6.x86_64 already installed and latest version Nothing to do [root@squid ~]# ================================== do u mean i need to set option while comoiling squid ?? i have another question : i have alot of errors after i loaded about 1000 users with 130 M to squid : here is it from cache.log ############################# {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:29.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: Closing client x.x.x.x connection due to lifetime timeout 2013/02/23 08:20:30.001| http://www.bing.com/ 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:30.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: Closing client x.x.x.x connection due to lifetime timeout 2013/02/23 08:20:31.001| http://www.bing.com/ 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* Content-Type: application/x-www-form-urlencoded 2013/02/23 08:20:31.001| WARNING: HTTP header contains NULL characters {Accept: */* Content-Type: application/x-www-form-urlencoded} NULL {Accept: */* ################################################ here is my squid.conf file after some preparing : [root@squid ~]# cat /etc/squid/squid.conf | less # # # # ################### acl all src all acl manager proto cache_object acl localnet src 192.168.1.0/24 x.x.0.0/16 x.x.0.0/16 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 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 590 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT #Default:\ visible_hostname squid coredump_dir /var/spool/squid ####squidguard################### redirect_program /usr/local/bin/squidGuard -c /usr/local/squidGuard/squidGuard.conf redirect_children 300 cache_effective_user squid cache_effective_group squid ############################## #Recommended minimum configuration: # # Only allow cachemgr access from localhost http_access allow manager localhost http_access allow localnet http_access deny manager # Deny requests to unknown ports http_access deny !Safe_ports # Deny CONNECT to other than SSL ports http_access deny CONNECT !SSL_ports # And finally deny all other access to this proxy http_access deny all #Allow ICP queries from everyone icp_access allow all hierarchy_stoplist cgi-bin ? ##################### ####################################### access_log /var/log/squid/access.log cache_dir aufs /cache1 500000 32 256 cache_dir aufs /cache2 500000 32 256 cache_dir aufs /cache3 500000 32 256 cache_mem 2000 MB #access_log none #cache_store_log none ########################## http_port 127.0.0.1:3128 http_port x.x.x.x:65000 http_port 3128 http_port 3129 tproxy ########### Performance Related Config: hierarchy_stoplist cgi-bin ? forwarded_for off half_closed_clients off relaxed_header_parser on reload_into_ims on quick_abort_min 0 KB quick_abort_max 0 KB client_lifetime 15 minutes read_timeout 5 minutes request_timeout 1 minutes ie_refresh on vary_ignore_expire on ########################################## maximum_object_size_in_memory 64 KB memory_replacement_policy heap GDSF cache_replacement_policy heap LFUDA ########################################### ipcache_size 2048 ipcache_low 98 ipcache_high 99 memory_pools off pipeline_prefetch on ############################################ httpd_suppress_version_string on server_persistent_connections on client_persistent_connections on pconn_timeout 2 minutes persistent_request_timeout 1 minute ########################################### #### drx #via off visible_hostname squid #memory_cache_shared off ########### WCCP2 Config: wccp2_router x.x.x.x wccp_version 2 wccp2_forwarding_method 2 wccp2_return_method 2 #wccp2_assignment_method mask wccp2_service dynamic 80 wccp2_service_info 80 protocol=tcp flags=src_ip_hash priority=240 ports=80 wccp2_service dynamic 90 wccp2_service_info 90 protocol=tcp flags=dst_ip_hash,ports_source priority=240 ports=80 ########################################## ########################################### #default option 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 ################################################# hierarchy_stoplist cgi-bin ? forwarded_for on half_closed_clients off #persistent_request_timeout 2 minutes max_filedescriptors 65536 max_open_disk_fds 65536 relaxed_header_parser on reload_into_ims on client_lifetime 15 minutes read_timeout 5 minutes request_timeout 1 minutes #extension_methods NICK ie_refresh on ignore_expect_100 on vary_ignore_expire on ############################### ################################ httpd_suppress_version_string on server_persistent_connections on client_persistent_connections on pconn_timeout 2 minutes persistent_request_timeout 1 minute shutdown_lifetime 20 seconds ############################# cache_swap_low 98 cache_swap_high 99 cache_replacement_policy heap LFUDA #request_header_max_size 2048 KB #minimum_object_size 512 bytes #maximum_object_size 5 GB minimum_object_size 0 maximum_object_size 135128 kB negative_ttl 0 seconds ############################### fstab file : [root@squid ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Thu Feb 21 10:05:33 2013 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=7e8424aa-d3a7-4132-9bed-a40ac8400bb3 / ext4 defaults 1 1 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/sdb /cache1 ext4 noatime,barrier=0,data=writeback,commit=100 0 2 /dev/sdd /cache2 ext4 noatime,barrier=0,data=writeback,commit=100 0 2 /dev/sde /cache3 ext4 noatime,barrier=0,data=writeback,commit=100 0 2 ============================= also i note that there is a low speed in writing on my harddrives !!!! [root@squid ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 165G 145G 12G 93% / tmpfs 16G 0 16G 0% /dev/shm /dev/sdb 550G 1.2G 521G 1% /cache1 /dev/sdd 550G 1.2G 521G 1% /cache2 /dev/sde 550G 1.3G 521G 1% /cache3 [root@squid ~]# with it help ! with my best regards -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/slow-browsing-in-centos-6-3-with-squid-3-tp4658635p4658661.html Sent from the Squid - Users mailing list archive at Nabble.com.