Apache Mod Security Rule Update Broken
Apache ModSecurity rules break after update when CRS version changes.
Category archive
Published troubleshooting guides for apache issues.
Apache ModSecurity rules break after update when CRS version changes.
Apache mod_evasive blocks legitimate traffic when thresholds are too low.
Apache mod_xsendfile does not serve files when XSendFilePath is wrong.
Apache mod_sed does not process response when SedContentType is not set.
Apache mod_substitute does not replace content when FilterProtocol is wrong.
Apache mod_ext_filter corrupts response when conversion chain is broken.
Apache output rate limiting does not work when OutputFilter is wrong.
Apache balancer-manager is inaccessible when location block is misconfigured.
Apache WebSocket proxying fails when Upgrade headers are not forwarded.
Apache mod_lua scripts fail when Lua path or function is misconfigured.
Apache fails to start when IncludeOptional files are missing with RequiredNotFound.
Apache does not bind to expected ports when Listen is in wrong context.
Apache IP-based virtual hosts conflict when listening on same address.
Apache name-based virtual hosts do not match when ServerName is wrong.
Apache serves content from wrong VirtualHost when default is not first.
Apache suexec fails when wrapper script permissions or ownership are wrong.
Apache mod_php does not process PHP files when handler is misconfigured.
Apache mod_wsgi applications fail when Python path or virtualenv is wrong.
Apache mod_perl scripts fail when interpreter is not initialized.
Apache CGI scripts fail with permission denied when ExecCGI is not enabled.
Apache mod_info exposes sensitive configuration when not restricted.
Apache mod_status shows wrong statistics when ExtendedStatus is disabled.
Apache mod_deflate compression is ineffective when level is misconfigured.
Apache mod_headers Header add directive does not work in wrong context.
Apache mod_expires does not set Cache-Control when ExpiresActive is off.
Apache serves wrong content type when AddType is misconfigured.
Apache AddHandler causes unexpected behavior with multiple file extensions.
Apache custom error pages are not served when paths are incorrect.
Apache piped logs fail when rotatelogs or external program cannot be executed.
Apache custom log format shows literal strings when quotes are misplaced.
Apache logs are not rotated when logrotate configuration is incorrect.
Apache request times out when backend does not send response within Timeout.
Apache prefork MPM consumes all memory when MaxRequestWorkers is too high.
Apache mod_jk AJP protocol fails when Tomcat connector is misconfigured.
Apache OpenIDC authentication fails when redirect URI is misconfigured.
Apache LDAP authentication times out when server is unreachable.
Apache SVN authentication fails when htpasswd file is misconfigured.
Apache WebDAV locking fails when DAVLockDB path is not writable.
Apache mod_fcgid kills processes when FcgidIOTimeout is exceeded.
Apache mod_cgid cannot create CGI socket when permissions are incorrect.
Apache proxy balancer marks members offline when health checks fail.
Apache mod_proxy_ajp cannot connect to Tomcat when AJP connector is down.
Apache mod_rewrite causes redirect loop when rules are not properly anchored.
Apache .htaccess directives are ignored when AllowOverride is set to None.
Apache MPM worker processes crash when MaxRequestWorkers is exceeded.
Apache ModSecurity blocks legitimate requests when WAF rules are too strict.
Apache SSL fails to start when certificate or key file paths are incorrect.
Apache returns 403 when Require directives deny access or DirectoryIndex is missing.
Apache returns 500 error when .htaccess has invalid directives or permissions are wrong.
Apache HTTPD fails to start due to port conflicts, syntax errors, or missing modules.