Hi, all! I've searched the archives and not been able to find an answer so I thought I'd post. Apologies if it's been covered before. In the squid document, the directive tcp_outgoing_address says: # NOTE: The use of this directive using client dependent ACLs is # incompatible with the use of server side persistent connections. To # ensure correct results it is best to set server_persistent_connections # to off when using this directive in such configurations. Can any one explain what is the client dependent ACL may occur error there ? And how can we use the header base acl ?