[CentOS] Question on http stop responding

I have a machine centos 5.1 fully up to patch that is on a network that 
has other machines
that takes credit cards. In such an environment I have found that there 
is something called
PCI - Payment Card Industry standards.

They are scanning my machine to make sure it is OK to be on this network.
One of the faults coming back is "Web server stops responding" to 3 
consecutive HTTP attempts

Is this a setting in http?
Anyone familiar with this?

Thanks,

Jerry