The Apache "KeepAlive" directive should be configured appropriately. (1) On / Off (1) Apache configuration file: KeepAlive directive L1 10. Denial of Service (DoS) Protective General Directives pg 16 1.13 Denial of Service Prevention Tuning p21 CIS Apache Benchmark for Unix v1.7 For Apache Versions 1.3 and 2.0 CIS 2007-07-01 Version 1.7 Prose (PDF) Security Configuration Benchmark For Apache Web Server CIS 2008-11-01 Version 2.2.0 Prose (PDF)