The Apache "MaxClients" directive should be configured appropriately.
(1) Number value
(1) Apache configuration file: MaxClients directive
1.13 Denial of Service Prevention Tuning p22
Rule Title: The httpd.conf MaxClients directive must be set properly.
STIG ID: WA000-WWA032 A22 Rule ID: SV-36649r1_rule Vuln ID: V-13730
Severity: CAT II Class: Unclass
Security Configuration Benchmark For Apache Web Server
CIS
2008-11-01
Version 2.2.0
Prose (PDF)
DISA STIG
Apache SERVER 2.2 for Unix
Release: 1 Benchmark Date: 23 Nov 2011
DISA
2011-11-23
V1R1
Prose (PDF)