Hi, I have recompiled squid3 on Debian Squeeze because the Debian repo' deb omits the --enable-ssl' '--enable-http-violations' options. For testing purposes I added this into the squid.conf: header_replace User-Agent Mozilla However, the user agent is not replaced when the client connects with a test apache server: (from the access.log) 62.123.123.123 - - [04/Aug/2011:10:10:41 +0200] "GET /favicon.ico HTTP/1.1" 404 256 "-" "Mozilla/5.0 (Android; Linux armv7l; rv:5.0) Gecko/20110615 Firefox/5.0 Fennec/5.0" I know that its coming in via the squid proxy because the IP address is that of the squid proxy, although obfuscated in example above. I read the squid-proxy.org details and the syntax looks correct, and squid did not choke on it. Compiled options below for squid3: # squid3 -v Squid Cache: Version 3.1.6 configure options: '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=${prefix}/lib/squid3' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' '--srcdir=.' '--datadir=/usr/share/squid3' '--enable-ssl' '--enable-http-violations' '--sysconfdir=/etc/squid3' '--mandir=/usr/share/man' '--with-cppunit-basedir=/usr' '--enable-inline' '--enable-async-io=8' '--enable-storeio=ufs,aufs,diskd' '--enable-removal-policies=lru,heap' '--enable-delay-pools' '--enable-cache-digests' '--enable-underscores' '--enable-icap-client' '--enable-follow-x-forwarded-for' '--enable-auth=basic,digest,ntlm,negotiate' '--enable-basic-auth-helpers=LDAP,MSNT,NCSA,PAM,SASL,SMB,YP,DB,POP3,getpwnam,squid_radius_auth,multi-domain-NTLM' '--enable-ntlm-auth-helpers=smb_lm,' '--enable-digest-auth-helpers=ldap,password' '--enable-negotiate-auth-helpers=squid_kerb_auth' '--enable-external-acl-helpers=ip_user,ldap_group,session,unix_group,wbinfo_group' '--enable-arp-acl' '--enable-esi' '--disable-translation' '--with-logdir=/var/log/squid3' '--with-pidfile=/var/run/squid3.pid' '--with-filedescriptors=65536' '--with-large-files' '--with-default-user=proxy' '--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -g -Wall -O2' 'LDFLAGS=' 'CPPFLAGS=' 'CXXFLAGS=-g -O2 -g -Wall -O2' --with-squid=/usr/src/squid3-3.1.6 Would some one confirm my syntax is correct, and should do as it says? Also, where did I go wrong? Clues on a candid postcard :) Cheers, S. -- Cyberpunk FPS/MMORG www.neocron.com / forum.neocron.com Runs on Windows, platinum in latest WINE/Ubuntu. Running since 2002.