Hi, I have two servers Windows 2003 with SQUID 2.7 stable 3, one of them act as origin for the two squid instances, hence one squid installation co-exist on the same box with IIS application and web site, the two squid works as expected as long as ICP and cache hierarchy is not used, only one cache_peer as parent and origin. To enhance the site performance we decide to use ICP and make one server use the second server squid as its sibling with proxy-only option, we always get ICP_MISS in the cache log even though we are sure the URL is cached in the first SQUID cache!, the below are the configuration: Server1 (Origin with IIS site and SQUID cache), IP 10.10.0.191: cache_peer 10.11.0.197 parent 80 0 no-query originserver acl usasite dstdomain 10.10.0.191 cache_peer_access 10.11.0.197 allow usasite cache_peer_access 10.11.0.197 deny all http_access allow usasite icp_port 3130 icp_access allow all Server2(IP 10.10.10.16): http_port 10.10.10.16:80 accel defaultsite=10.10.10.16 cache_peer 10.10.0.191 sibling 80 3130 proxy-only cache_peer 10.11.0.197 parent 80 0 no-query originserver acl usasite dstdomain 10.10.10.16 cache_peer_access 10.11.0.197 allow usasite cache_peer_access 10.11.0.197 deny all cache_peer_access 10.10.0.191 allow usasite cache_peer_access 10.10.0.191 deny all http_access allow usasite icp_port 3130 icp_access allow all Please help Atef A. M. AlQashqish Operation Manager / MCSE, MCT, ITIL Certified Service Manager iHorizons Tel : - +962 6 534 1640 ext 61 Mobile:- +962 777 530053 Fax:- +962 6 534 1927 P.O. BOX 1610 Jubaiha 11941 Amman - Jordan http://www.iHorizons.com