Website Showing 500 Internal Server Error: Causes and Fixes

The 500 Internal Server Error is one of the most common and frustrating errors you'll encounter as a website owner. Unlike client-side errors (like 404 Not Found), a 500 error indicates that something went wrong on the server side while processing your request. The good news is that in most cases, this error is caused by something within your control and can be resolved without contacting support.

What Is a 500 Internal Server Error?

The HTTP 500 status code is a generic server-side error message. The server encountered an unexpected condition that prevented it from fulfilling the request. Because it's a catch-all error, the actual cause can vary widely — from a misconfigured .htaccess file to a PHP script that's run out of memory.

Common Causes and Solutions

1. Corrupted or Misconfigured .htaccess File

The .htaccess file in your website's root directory controls URL rewriting, redirects, and various Apache directives. A single syntax error in this file can cause a 500 error across your entire site.

How to fix:

Log into cPanel via billing.sakurahost.co.tz and open File Manager.

Navigate to your website's document root (usually public_html). Enable "Show Hidden Files" in File Manager settings.

Find the .htaccess file and rename it to .htaccess_backup.

Test your website. If it loads, the .htaccess file was the problem. Create a new .htaccess file with default content for your CMS.

For WordPress sites, the default .htaccess content is:

# BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}] RewriteBase / RewriteRule ^index.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule> # END WordPress

2. PHP Memory Limit Exhausted

If your PHP scripts consume more memory than the allocated limit, the server terminates the script and returns a 500 error.

How to fix: Add the following to your php.ini file or .htaccess:

; In php.ini or .user.ini memory_limit = 256M max_execution_time = 300 ; Or in .htaccess php_value memory_limit 256M php_value max_execution_time 300

You can also adjust PHP settings through cPanel under Software > MultiPHP INI Editor.

3. Incorrect File Permissions

Linux servers require specific file permissions for your website to function correctly. Incorrect permissions can prevent PHP files from executing.

Correct permissions:

  • Directories: 755 (drwxr-xr-x)
  • Files: 644 (-rw-r--r--)
  • wp-config.php: 600 or 640 for enhanced security
# Fix permissions via SSH or Terminal in cPanel find /home/username/public_html -type d -exec chmod 755 {} ; find /home/username/public_html -type f -exec chmod 644 {} ;

4. Faulty Plugin or Theme (WordPress)

A recently installed or updated WordPress plugin or theme can cause fatal PHP errors resulting in a 500 error.

How to fix:

  • Use File Manager or FTP to navigate to wp-content/plugins/
  • Rename the plugins folder to plugins_disabled
  • If the site loads, rename it back and then rename individual plugin folders one by one to identify the culprit
  • Similarly, switch to a default theme by renaming your active theme's folder in wp-content/themes/

5. PHP Version Incompatibility

Running outdated PHP code on a newer PHP version (or vice versa) can cause fatal errors.

How to fix: In cPanel, go to Software > MultiPHP Manager and try switching your domain to a different PHP version. WordPress 6.x works best with PHP 8.0, 8.1, or 8.2. Some older plugins may require PHP 7.4.

6. Server Resource Limits

On shared hosting, your account has limits for CPU, memory, I/O, and concurrent processes. Exceeding these limits triggers a 500 error.

How to check: In cPanel, go to Metrics > Resource Usage to see if you're hitting any limits. If you consistently hit resource limits, consider upgrading your hosting plan.

Checking Error Logs

The fastest way to diagnose a 500 error is to check your error logs:

In cPanel, go to Metrics > Errors to view the most recent 300 Apache error log entries.

Look for entries with the timestamp matching when the 500 error occurred. The log will show the exact file and line number causing the problem.

You can also enable WordPress debug mode to get more detailed error messages. Add this to wp-config.php:

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

Check the debug log at wp-content/debug.log for detailed error messages.

Security Note: Always disable debug mode on production sites once you've resolved the issue. Leaving WP_DEBUG enabled can expose sensitive information. Set it back to false after troubleshooting.

When to Contact Support

If you've tried all the above solutions and the error persists, it may be a server-side issue beyond your control. Contact SakuraHost support at billing.sakurahost.co.tz/submitticket.php with:

  • Your domain name and the exact URL producing the error
  • When the error first appeared and any recent changes you made
  • Screenshots of the error and any relevant error log entries
  • Steps you've already taken to troubleshoot
Further Reading: For a deep dive into browser developer tools and network debugging, check Chrome DevTools documentation by Google. You can use the Network tab to inspect HTTP response codes and headers in real time.
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