Troubleshooting WordPress: Fixing 500 Internal Server Error & Critical Errors

Diagnosing 500 Internal Server Error#

A 500 Internal Server Error indicates a fatal PHP script halt.

Diagnostic Checklist:#

1. 1
   Check error_log: Open File Manager -> public_html/error_log -> scroll to bottom to see the exact fatal PHP file and line number.
2. 2
   Deactivate Plugins: Rename wp-content/plugins to wp-content/plugins_temp to restore admin access.
3. 3
   Reset .htaccess: Rename .htaccess to .htaccess_old and save default WordPress rewrite rules.
4. 4
   Increase Memory: Add define('WP_MEMORY_LIMIT', '512M'); in wp-config.php.