500 Internal Server Error – Causes & Solutions

Here’s a rearranged Omniverse-style version of your 500 Internal Server Error article, structured clearly for theme documentation with organized sections, concise explanations, and practical troubleshooting steps:

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500 Internal Server Error – Causes & Solutions #

The 500 Internal Server Error is one of the most common issues on WordPress websites. It may occur due to server configuration, plugins, themes, or WordPress core files.

This guide outlines the most common causes and how to troubleshoot them.

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Common Causes of 500 Internal Server Error #

1. Server Misconfiguration #

Incorrect server directives or hosting configuration can trigger this error on both Apache and IIS servers.

What to do:

• Contact your hosting provider for server diagnostics.
• Check server logs for detailed error messages.

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2. Incorrect File & Folder Permissions #

Improper permissions can block server access and cause errors.

Recommended permissions:

• Folders: 755
• Files: 644

Using overly permissive settings like 777 can cause security issues and server errors.

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3. Broken Files or PHP Errors #

Corrupted files or PHP coding issues in WordPress core, plugins, or themes may trigger the error.

Possible fixes:

• Reinstall WordPress core files.
• Temporarily deactivate third-party plugins.
• Reset or reinstall your theme.
• Check for file encoding or upload issues.

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4. Corrupted .htaccess File #

The .htaccess file controls permalinks and server rules. Errors in this file often cause a 500 error.

How to fix:

1. Access your site via FTP or file manager.
2. Locate the .htaccess file in the WordPress root folder.
3. Download a backup copy and rename it (e.g., .htaccess-copy).
4. Delete the original .htaccess.
5. Create a new blank .htaccess file and upload it.
6. Log in to WordPress admin.
7. Go to Settings → Permalinks and click Save Changes.

WordPress will automatically generate a new valid .htaccess file.

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5. Plugin Conflicts #

Conflicting or faulty plugins can cause server errors.

Troubleshooting steps:

• Disable all plugins via the admin panel.
• Reactivate them one by one to identify the problematic plugin.

If you cannot access admin:

1. Connect via FTP.
2. Rename /wp-content/plugins to something like /plugins-old.
3. Log in to admin and deactivate plugins.
4. Restore the folder name and reactivate plugins individually.

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6. Insufficient PHP Memory Limit #

Low PHP memory or server resource limits may cause a 500 error.

Recommended minimum values:

• memory_limit: 128M or higher
• max_execution_time: 180
• post_max_size: 64M
• upload_max_filesize: 64M

Solutions:

• Ask your hosting provider to increase limits.
• Use FTP for large uploads if limits cannot be increased.

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Final Recommendations #

• Always keep backups before troubleshooting.
• Update WordPress, themes, and plugins regularly.
• Consult hosting support if the issue persists.