The 500 Internal Server Error is one of the most frustrating WordPress errors you'll encounter. Not because it's hard to fix, but because the error message tells you almost nothing.

"500 Internal Server Error" just means something went wrong on the server. What went wrong? The error doesn't say.

What Causes a 500 Error?

A 500 error is a server-level error, similar to the White Screen of Death and WordPress Critical Error. In fact, these are all variations of the same underlying problem: something in your site's code or server configuration failed.

Common causes include:

  • Plugin conflicts: A plugin update introduced buggy code
  • Theme problems: Theme code failing during execution
  • Corrupted .htaccess file: Malformed rewrite rules
  • PHP memory limits: Server running out of memory
  • File permission issues: Incorrect permissions preventing file access
  • PHP version incompatibility: Code not compatible with server's PHP version

The Vagueness Problem

Here's the reality: the vagueness of a 500 error isn't going to help a non-technical person troubleshoot.

When we see a 500 error, we go directly to the server logs. The server knows exactly what happened: which file, which line, which error. The "500 Internal Server Error" message is what visitors see; the actual details are in the logs.

If you don't have access to server logs or don't know how to read them, you'll need someone who does.

Finding the Real Error

Check Server Error Logs

Most hosting providers give you access to error logs through:

  • cPanel: Error Logs section or File Manager → logs folder
  • Plesk: Logs section under your domain
  • Custom panels: Look for "Logs" or "Error Logs."

The most recent entries will show you what's actually failing.

Enable WordPress Debug Mode

If you can't access server logs, enable WordPress debug mode:

  1. Access wp-config.php via FTP or file manager
  2. Find define('WP_DEBUG', false);
  3. Change it to define('WP_DEBUG', true);
  4. Reload your site. The actual error should now display.

Important: Turn debug mode off after troubleshooting. You don't want error messages displaying publicly.

Common Fixes

Corrupted .htaccess

A corrupted .htaccess file is one of the most common causes of 500 errors.

  1. Access your site via FTP/SFTP
  2. Find the .htaccess file in your root WordPress directory
  3. Rename it to .htaccess-backup
  4. Try loading your site

If the site works, the problem was with your .htaccess file. To regenerate it:

  1. Log in to WordPress admin
  2. Go to Settings → Permalinks
  3. Click "Save Changes" (even without changing anything)

WordPress will create a fresh .htaccess file.

If you're wondering what went wrong or want to understand how .htaccess works to prevent future issues, see our complete guide to WordPress .htaccess redirects.

Plugin Issues

If a plugin is causing the error:

  1. Rename the /wp-content/plugins/ folder to /plugins-disabled/
  2. Check if the site loads
  3. If it does, rename it back and deactivate plugins one by one to find the problem

Theme Issues

If you suspect the theme:

  1. Rename your active theme folder in /wp-content/themes/
  2. WordPress will fall back to a default theme
  3. If the site loads, the problem is in your theme

PHP Memory Limits

If the error log mentions memory exhaustion:

  1. Try adding to wp-config.php: define('WP_MEMORY_LIMIT', '256M');
  2. If that doesn't work, contact your host about increasing PHP memory limits

See our Memory Exhausted guide for more details.

File Permissions

Incorrect file permissions can cause 500 errors:

  • Folders should typically be 755
  • Files should typically be 644

Your hosting provider can help verify and fix permissions if needed.

The Recreating Problem

Here's a challenge with 500 errors: they sometimes occur only under certain conditions. A specific page, a specific action, a specific combination of factors.

The number one rule of troubleshooting is to be able to reproduce the error to fix it. If a 500 error is intermittent, we may need you to try different things (visit specific pages or perform specific actions) to help us trigger it while we're watching the logs.

When to Call for Help

If you've checked for a corrupted .htaccess, tested your plugins, and the error persists, especially if you can't make sense of the server logs, it's time for professional help.

500 errors are frustrating because they're vague, but they're usually straightforward once someone can read the actual error in the server logs. With good logging and server access, we can typically resolve these quickly.

Prevention

  • Update carefully: Update plugins one at a time
  • Maintain backups: Be ready to restore if something breaks
  • Use managed hosting: Good hosting includes monitoring that catches server errors immediately
  • Keep .htaccess clean: Be cautious about plugins that modify .htaccess

With proper server monitoring, 500 errors trigger immediate alerts. We often know about these issues and start investigating before clients notice anything is wrong.

Stuck on a 500 error? Contact our support team for fast, expert diagnosis.

This article is part of our WordPress Troubleshooting guide, a complete resource for diagnosing and fixing common WordPress errors.