Apache Timeout/KeepAlive

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http://serverfault.com – I run several apache web servers on CentOS 5.x and they all seem to have the same problem. It is typically fast but at times the browser will just sit there waiting forever and it never fails or goes through. Typically if you open a new tab and try again it goes through. I have keepalive turned off in httpd.conf. The servers that have this issue are behind a Cisco ASA firewall. Has anyone else seen these problems? Is it worth trying to turn on KeepAlive? It doesn't happen all the time but I have noticed every night at about 7 PM for about 5 minutes the one web server is unavailable. (HowTos)