Linux Apache Error Codes — AH01630, AH00558 & Module Errors

Overview

Fix common Apache HTTP Server errors including AH01630 (client denied by server), AH00558 (ServerName), permission errors, and module loading failures.

Key Details

• Apache errors use 'AH' prefix codes logged to /var/log/apache2/error.log or /var/log/httpd/error_log
• AH01630: client denied by server configuration (Require directive blocking access)
• AH00558: Could not reliably determine the server's fully qualified domain name
• AH00016: Module already loaded — duplicate LoadModule directive
• AH01797: Client exceeded MaxRequestLen — request body too large

Common Causes

• AH01630: missing Require all granted in directory or location block
• AH00558: ServerName not set in Apache config
• AH00016: same module loaded twice in config files
• Permission errors: Apache user (www-data/apache) cannot read document root files
• SELinux blocking Apache from serving content

Steps

1. 1For AH01630: add 'Require all granted' in the Directory block for your document root
2. 2For AH00558: add ServerName localhost to /etc/apache2/apache2.conf or httpd.conf
3. 3Check for duplicate modules: apachectl -M | sort to list loaded modules
4. 4Fix permissions: chown -R www-data:www-data /var/www/html and chmod -R 755 /var/www/html
5. 5For SELinux: sudo chcon -Rt httpd_sys_content_t /var/www/html

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