Quick answer
- A 500 Internal Server Error means something went wrong on the server, but it doesn’t say what.
- The most common causes are a faulty plugin or theme, a corrupted .htaccess file, a low PHP memory limit or an incompatible PHP version.
- Check your server error log first. It usually names the problem file.
- Work through the fixes one at a time, and restore a backup if nothing works.
The 500 error is frustrating because it’s vague. The good news is that the cause is usually one of a few things. Here’s how to find and fix it.
Step 1: Check the error log
Look in your hosting dashboard’s error logs, or enable WordPress debug logging. The log often names the plugin or file causing the problem.
Step 2: Reset .htaccess
- Connect via SFTP or your host’s file manager.
- Rename .htaccess to .htaccess_old.
- Reload the site. If it works, go to Settings → Permalinks and save to create a fresh file.
Step 3: Deactivate plugins
- Rename the wp-content/plugins folder to plugins_old.
- If the site loads, rename it back and reactivate plugins one by one to find the culprit.
Step 4: Switch to a default theme
Rename your theme’s folder so WordPress falls back to a default theme.
Step 5: Increase the PHP memory limit
Ask your host, or raise WP_MEMORY_LIMIT in wp-config.php.
Step 6: Check the PHP version
An outdated or too-new PHP version can break old plugins. Change it in your hosting panel.
Step 7: Contact your host
If nothing works, your host can check server logs and configuration.
Prevent it
- Keep backups.
- Update plugins one at a time.
- Test big changes on a staging site.
FAQs
Usually a plugin or theme conflict, a corrupted .htaccess file, low PHP memory or a PHP version problem.
Usually not. The database stays intact.
Yes, via SFTP or your host’s file manager.
In your hosting dashboard, or in wp-content/debug.log if debug logging is on.
Yes, if the basic fixes don’t work.
Update carefully, use staging and keep backups.
