1. Sibling A receives 1st request for R and responds with tcp_miss and FIRST_UP_PARENT. 2. Sibling B receives 2nd request for R and responds with sibling_hit due to sibling A. 3. After R object gets expired, sibling A receives 3rd request for R and responds with tcp_miss and FIRST_UP_PARENT. 4. Sibling B receives 4th request for R and should respond with sibling_hit but tcp_miss and FIRST_UP_PARENT. The object R has been refreshed in step 3, why does sibling B responds with FIRST_UP_PARENT in step 4? Another weird thing is that there is no icp_query log in access.log after the object R got expired. Is it because of my conf? below is my conf. authenticate_cache_garbage_interval 3600 seconds authenticate_ttl 3600 seconds authenticate_ip_ttl 0 seconds acl all src ::/0 acl our_sites dstdomain os-private-beta.line.naver.jp acl manager proto cache_object acl localhost src ::1 127.0.0.1 acl to_localhost dst ::1 0.0.0.0 127.0.0.0/8 acl sibling2 src 10.101.28.153 acl sibling3 src 10.101.31.186 acl localnet src 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 acl SSL_ports port 443 acl Safe_ports port 80 21 443 70 210 1025-65535 280 488 591 777 20080 acl CONNECT method CONNECT follow_x_forwarded_for Deny all acl_uses_indirect_client on delay_pool_uses_indirect_client on log_uses_indirect_client on http_access Allow our_sites http_access Allow manager localhost http_access Allow manager localnet http_access Deny manager http_access Deny !Safe_ports http_access Deny CONNECT !SSL_ports http_access Deny to_localhost http_access Allow localnet http_access Allow localhost http_access Deny all icp_access Allow localnet icp_access Deny all htcp_access Deny all htcp_clr_access Deny all miss_access Allow all ident_lookup_access Deny all http_port 0.0.0.0:80 defaultsite=os-private-beta.line.naver.jp name=80 connection-auth=on http_port 0.0.0.0:20080 name=20080 connection-auth=on ssl_unclean_shutdown off sslproxy_version 1 cache_peer 10.101.55.24 Parent 80 0 name=obsAccel no-query no-digest originserver connection-auth=auto cache_peer_access obsAccel Allow our_sites cache_peer_access obsAccel Deny all cache_peer 10.101.28.153 Sibling 80 3130 name=obsSquid2 no-digest no-delay connection-auth=auto cache_peer_access obsSquid2 Allow our_sites cache_peer 10.101.31.186 Sibling 80 3130 name=obsSquid3 no-digest no-delay connection-auth=auto cache_peer_access obsSquid3 Allow our_sites dead_peer_timeout 10 seconds forward_max_tries 10 hierarchy_stoplist cgi-bin hierarchy_stoplist ? cache_mem 268435456 bytes maximum_object_size_in_memory 524288 bytes memory_replacement_policy lru cache_replacement_policy lru cache_dir ufs /home1/squid/cache 1024 16 256 IOEngine=Blocking store_dir_select_algorithm least-load max_open_disk_fds 0 minimum_object_size 0 bytes maximum_object_size 209715200 bytes cache_swap_low 90 cache_swap_high 95 logformat custom %tl %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt access_log /var/log/squid/access.log squid access_log /var/log/squid/access_custom.log custom access_log none manager cache_store_log /var/log/squid/store.log logfile_rotate 7 emulate_httpd_log off log_ip_on_direct on mime_table /etc/squid/mime.conf log_mime_hdrs off pid_filename /var/run/squid.pid log_fqdn off client_netmask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff strip_query_terms on buffered_logs off cache_log /var/log/squid/cache.log debug_options ALL,1 rotate=7 coredump_dir /var/spool/squid ftp_user Squid@ ftp_list_width 32 ftp_passive on ftp_epsv_all off ftp_epsv on ftp_sanitycheck on ftp_telnet_protocol on diskd_program /usr/lib64/squid/diskd unlinkd_program /usr/lib64/squid/unlinkd url_rewrite_children 5 url_rewrite_concurrency 0 url_rewrite_host_header on url_rewrite_bypass off refresh_pattern ^http: 2 20% 5 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 quick_abort_min 16 KB quick_abort_max 16 KB quick_abort_pct 95 read_ahead_gap 16384 bytes negative_ttl 0 seconds positive_dns_ttl 21600 seconds negative_dns_ttl 60 seconds range_offset_limit 0 bytes minimum_expiry_time 60 seconds store_avg_object_size 13 KB store_objects_per_bucket 20 request_header_max_size 65536 bytes reply_header_max_size 65536 bytes request_body_max_size 0 bytes client_request_buffer_max_size 524288 bytes chunked_request_body_max_size 65536 bytes icap_uses_indirect_client on via on ie_refresh off vary_ignore_expire off request_entities off relaxed_header_parser on ignore_expect_100 off forward_timeout 240 seconds connect_timeout 60 seconds peer_connect_timeout 30 seconds read_timeout 900 seconds request_timeout 300 seconds persistent_request_timeout 120 seconds client_lifetime 86400 seconds half_closed_clients off pconn_timeout 60 seconds ident_timeout 10 seconds shutdown_lifetime 30 seconds mail_program mail cache_effective_user squid httpd_suppress_version_string off umask 23 announce_period 31536000 seconds announce_host tracker.ircache.net announce_port 3131 httpd_accel_surrogate_id unset-id http_accel_surrogate_remote off esi_parser custom delay_pools 0 delay_initial_bucket_level 50 wccp_router :: wccp_version 4 wccp2_rebuild_wait on wccp2_forwarding_method gre wccp2_return_method gre wccp2_assignment_method hash wccp2_service standard 0 wccp2_weight 10000 wccp_address 0.0.0.0 wccp2_address 0.0.0.0 client_persistent_connections on server_persistent_connections on persistent_connection_after_error on detect_broken_pconn off digest_generation on digest_bits_per_entry 5 digest_rebuild_period 3600 seconds digest_rewrite_period 3600 seconds digest_swapout_chunk_size 4096 bytes digest_rebuild_chunk_percentage 10 snmp_port 0 snmp_access Deny all snmp_incoming_address :: snmp_outgoing_address ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff icp_port 3130 htcp_port 0 log_icp_queries on udp_incoming_address :: udp_outgoing_address ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff icp_hit_stale off minimum_direct_hops 4 minimum_direct_rtt 400 netdb_low 900 netdb_high 1000 netdb_ping_period 300 seconds query_icmp off test_reachability off icp_query_timeout 0 maximum_icp_query_timeout 2000 minimum_icp_query_timeout 5 background_ping_rate 10 seconds mcast_icp_query_timeout 2000 icon_directory /usr/share/squid/icons global_internal_static on short_icon_urls on error_log_languages on err_page_stylesheet /etc/squid/errorpage.css err_html_text email_err_data on nonhierarchical_direct on prefer_direct off always_direct Deny localnet incoming_icp_average 6 incoming_http_average 4 incoming_dns_average 4 min_icp_poll_cnt 8 min_dns_poll_cnt 8 min_http_poll_cnt 8 client_ip_max_connections -1 tcp_recv_bufsize 0 bytes icap_enable off icap_connect_timeout 0 seconds icap_io_timeout 0 seconds icap_service_failure_limit 10 icap_service_revival_delay 180 icap_preview_enable on icap_preview_size -1 icap_default_options_ttl 60 icap_persistent_connections on icap_send_client_ip off icap_send_client_username off icap_client_username_header X-Client-Username icap_client_username_encode off adaptation_service_iteration_limit 16 icap_retry Deny all icap_retry_limit 0 check_hostnames off allow_underscore on dns_retransmit_interval 5 seconds dns_timeout 120 seconds dns_defnames off hosts_file /etc/hosts ignore_unknown_nameservers on dns_v4_fallback on ipcache_size 1024 ipcache_low 90 ipcache_high 95 fqdncache_size 1024 memory_pools on memory_pools_limit 5242880 bytes forwarded_for on cachemgr_passwd XXXXXXXXXX all client_db on refresh_all_ims off reload_into_ims off maximum_single_addr_tries 1 retry_on_error off as_whois_server whois.ra.net offline_mode off uri_whitespace strip balance_on_multiple_ip off pipeline_prefetch off high_response_time_warning 0 high_page_fault_warning 0 high_memory_warning 0 bytes sleep_after_fork 0 windows_ipaddrchangemonitor on max_filedescriptors 0 http10 off -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Sibling-A-does-not-respond-with-sibling-hit-even-though-there-is-a-refreshed-item-in-the-sibling-B-S-tp4659197.html Sent from the Squid - Users mailing list archive at Nabble.com.