Sorry in my previous post I assumed I was running 2.6 Stable 6 and I wanted to u/g to Stable 19 but it appears I am running 2.5 Stable6 and I want to u/g to Squid 2.6 Stable 19 I have found that when I run squid -v I get the following output Squid Cache: Version 2.5.STABLE6 configure options: --build=i686-redhat-linux-gnu --host=i686-redhat-linux-gnu --target=i386-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --exec_prefix=/usr --bindir=/usr/sbin --libexecdir=/usr/lib/squid --localstatedir=/var --sysconfdir=/etc/squid --enable-poll --enable-snmp --enable-removal-policies=heap,lru --enable-storeio=aufs,coss,diskd,null,ufs --enable-ssl --with-openssl=/usr/kerberos --enable-delay-pools --enable-linux-netfilter --with-pthreads --enable-ntlm-auth-helpers=SMB,winbind --enable-external-acl-helpers=ip_user,ldap_group,unix_group,wbinfo_group ,winbind_group --enable-auth=basic,ntlm --with-winbind-auth-challenge --enable-useragent-log --enable-referer-log --disable-dependency-tracking --enable-cachemgr-hostname=localhost --disable-ident-lookups --enable-truncate --enable-underscores --datadir=/usr/share --enable-basic-auth-helpers=LDAP,MSNT,NCSA,PAM,SMB,YP,getpwnam,multi-dom ain-NTLM,SASL,winbind Does that mean I can just run ./configure from the folder in which I extracted the Squid 2.6 Stable19 files with the above command line switches and I will have Stable 19 installed? I assume I would have to restart the squid service! Any info would be greatly appreciated Scott