The ApacheErrorDocument directive should be set correctly for HTTP 500 errors. (1) message/document (1) Apache configuration file: 'ErrorDocument 500' directive L1 11. Web Server Software Obfuscation General Directives p17 2.7 Additional Software Information Leakage Protection p50 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)