I have found that Squid only has 16384 file descriptors available (despite ulimit, etc. seems to be config properly). Squid was installed via yum (squid-2.6.STABLE21-6.el5) and it seems that it has this config --with-maxfd=16384 so max_filedesc setting is probably being useless. I will rebuild squid-2.6.STABLE21-6.el5.src.rpm without --with-maxfd setting and see if it works -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/About-bottlenecks-Max-number-of-connections-etc-tp4658650p4658666.html Sent from the Squid - Users mailing list archive at Nabble.com.