Had an oddity at work yesterday with a customer who's load balanced webservers seemed to stop responding around a similar time each day. Nothing obvious in the logs (two of us had a look for stuff) on either the load balancer or the servers themselves. Eventually whilst looking at the boxes the fault re-occurred and we managed to track it down to Apache running out of sessions, as it was set to the default of 150. Nice and simple to resolve. Whats baffling us is that none of the apache logs make any reference to it having Maxed out the number of sessions, which both of us expected to have seen. Is there any way this logging level could have been disabled? There seems to be plenty of logging taking place, or certainly the default amount.