Troubleshooting Internal Server Error 500 in WordPress

Resolving Internal Server Error 500 in WordPress: A Comprehensive Guide

Internal Server Error 500 is one of the most frustrating and ambiguous errors encountered by WordPress website owners and developers. This error can seemingly appear out of nowhere, leaving your site inaccessible and visitors perplexed. In this comprehensive guide, we’ll explore the root causes of Internal Server Error 500 and provide step-by-step solutions to get your WordPress site back up and running smoothly. Let’s dive in and decode this enigmatic error!

Understanding Internal Server Error 500

The Internal Server Error 500 is a generic HTTP status code that indicates something has gone awry on the server, but the server can’t precisely pinpoint the issue. It’s like your website’s way of saying, “Something’s wrong, but I can’t quite figure out what.” This could be due to a range of factors, from corrupted files to problematic plugins or even server misconfigurations.

1. Plugin and Theme Compatibility Issues

Plugins and themes are fantastic tools to extend your WordPress site’s functionality and design. However, certain plugins or themes might not play well together or might not be compatible with the current version of WordPress.

Solution: Deactivate all plugins and revert to a default WordPress theme. If the error vanishes, proceed to reactivate plugins individually to pinpoint the problematic one. Consider updating your plugins and themes to the latest versions and ensuring they are compatible with your WordPress version.

2. Corrupted .htaccess File

The .htaccess file is a critical configuration file for your WordPress site. A corrupted or misconfigured .htaccess file can trigger the Internal Server Error 500.

Solution: Access your website via FTP or the file manager provided by your hosting provider. Locate the .htaccess file in your site’s root directory and rename it (e.g., to “.htaccess_old”). Then, try accessing your site. If it works, go to your WordPress dashboard, navigate to Settings > Permalinks, and hit “Save” to generate a new .htaccess file.

3. Exhausted PHP Memory Limit

Sometimes, complex plugins or themes might consume more PHP memory than the default limit, leading to the Internal Server Error 500.

Solution: You can increase the PHP memory limit by adding the following line to your wp-config.php file:

define('WP_MEMORY_LIMIT', '256M');

This raises the memory limit to 256MB. Remember to save the file and refresh your site.

4. Corrupted WordPress Core Files

Occasionally, core WordPress files can become corrupted due to incomplete updates or malware.

Solution: Reinstall WordPress without affecting your content. Download the latest version of WordPress, extract it, and upload all files to your server, excluding the “wp-content” folder. This ensures your themes, plugins, and media remain intact.

5. Server Misconfigurations

Server misconfigurations, such as incorrect file permissions or problems with your web server’s configuration, can lead to Internal Server Error 500.

Solution: Contact your hosting provider’s support. They can verify if there are any server-side issues causing the error. They might also help you fix file permission issues that could be contributing to the problem.

6. Incompatible PHP Version

Using an outdated or incompatible PHP version can trigger this error.

Solution: Ensure that your hosting environment is running a PHP version compatible with your WordPress version. Consider upgrading PHP to a newer version for better performance and security.

7. Debugging with Error Logs

If none of the above solutions work, you can turn on debugging mode in WordPress to gather more information about the error.

Solution: Add the following lines to your wp-config.php file:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

This will log errors to a debug.log file, which you can find in the “wp-content” directory. Check the log for clues about what’s causing the Internal Server Error 500.


Internal Server Error 500 can be perplexing, but armed with the right knowledge and solutions, you can troubleshoot and resolve this issue efficiently. By methodically identifying and addressing the underlying causes, you can ensure your WordPress site remains accessible, functional, and a positive experience for both visitors and administrators.

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