Hi, I've found the cause of my problem after extensive debugging. It's a general tcp_outgoing_* issue. The persistent connection management doesn't care about tcp_outgoing_* when reusing existing connections to the same destination host. So never use tcp_outgoing_* selection without setting "server_persistent_connections off". Shame on me - the bug is already confirmed since 2002: http://www.squid-cache.org/bugs/show_bug.cgi?id=454 Bye Marek
