Using squid 3.2 and I frequently see such problem: 2012/09/16 17:49:02 kid1| Failed to select source for 'http://www.googleads.g.doubleclick.net/pagead/viewthroughconversion/1033191019/?value=0&label=LDO7CJ2XvwMQ6_zU7AM&guid=ON&script=0' 2012/09/16 17:49:02 kid1| always_direct = 1 2012/09/16 17:49:02 kid1| never_direct = 0 2012/09/16 17:49:02 kid1| timedout = 0 Note that this is actually an NXDOMAIN error , however I would like to make squid not retry and fail fast and don't print these out, what config directive do I need? Thanks.