Hi All, Your guidance is required regarding compilation. I had compiled squid-3.0.STABLE25 with the following options: ./configure --prefix=/usr --includedir=/usr/include --datadir=/usr/share --bindir=/usr/sbin --libexecdir=/usr/lib/squid --localstatedir=/var --sysconfdir=/etc/squid --enable-cache-digests --enable-removal-policies=lru --enable-delay-pools --enable-storeio=aufs,ufs --with-large-files --disable-ident-lookups --with-default-user=proxy --enable-basic-auth-helpers="LDAP" --enable-auth="basic,negotiate,ntlm" --enable-external-acl-helpers="wbinfo_group,ldap_group" --enable-negotiate-auth-helpers="squid_kerb_auth" I wonder how my squid_kerb_ldap helper was working which i was using for authorization. As i did not mentioned during compilation?? Second question is that as i have decided to upgrade to 3.1.3 where i also want to include Heap support.how to do it ? just adding this option --enable-removal-policies lru,heap while keeping other options same?? in my squid.conf i had this directive cache_replacement_policy lru how would/should it be redefined/changed for optimal performance ((Single Hard disk being used for caching of 71 GB SAS15k out of which 50 gb is allocated to cache directory)) regards, Bilal _________________________________________________________________ Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. https://signup.live.com/signup.aspx?id=60969