Error 500 on a Website: What It Is and How to Fix It

A 500 Internal Server Error is one of the most common, disruptive, and misunderstood errors you can encounter on the web. Unlike client-side errors such as 404 (Not Found) or 403 (Forbidden), a 500 error originates entirely on the server — meaning the problem has nothing to do with the visitor's browser, device, or internet connection. Instead, something on the server itself has failed, and the server doesn't know how to recover or explain what went wrong.

For website owners and administrators, this error can be alarming. For visitors, it's simply a dead end. The good news is that in the vast majority of cases, a 500 Internal Server Error is diagnosable and fixable — often without needing advanced technical expertise.

This comprehensive guide covers everything you need to know: what the error means, why it happens, and exactly how to resolve it step by step.

What Is a 500 Internal Server Error?

The 500 Internal Server Error is a generic HTTP status code returned by a web server when it encounters an unexpected condition that prevents it from fulfilling a browser's request. It's essentially the server's way of saying, "Something went wrong, but I can't tell you exactly what."

Because it's a catch-all error code, it can be triggered by dozens of different underlying issues — from a single misplaced character in a configuration file to a resource-hungry script consuming all available server memory.

Common Variations of the 500 Error Message

Depending on the server software, hosting environment, and browser, you may see this error displayed in several different ways:

• 500 Internal Server Error
• HTTP Error 500
• 500 – Internal Server Error
• The website cannot display the page
• HTTP 500 – Internal Server Error
• Temporary Error (500)
• Internal Server Error – The server encountered an internal error or misconfiguration and was unable to complete your request

Regardless of how it's worded, all of these messages point to the same root issue: a server-side failure.

500 vs. Other HTTP Errors

Understanding that a 500 error is server-side is critical — it tells you exactly where to focus your troubleshooting efforts.

Common Causes of a 500 Internal Server Error

Before you can fix a 500 error, you need to understand what's causing it. Here are the most frequent culprits:

1. Corrupted or Misconfigured .htaccess File

The .htaccess file is a powerful Apache server configuration file that controls redirects, URL rewrites, access restrictions, caching rules, and more. A single syntax error, an invalid directive, or a corrupted file can immediately trigger a 500 error across your entire website.

This is one of the most common causes, particularly after installing a new plugin, making manual edits, or migrating a website.

2. PHP Errors and Script Failures

PHP powers the majority of dynamic websites on the internet today, including WordPress, Joomla, Drupal, and countless custom applications. If a PHP script encounters a fatal error — such as a syntax mistake, an undefined function call, or an infinite loop — the server may return a 500 error instead of displaying the page.

Common PHP-related triggers include:

• Syntax errors (missing semicolons, unclosed brackets)
• Calling deprecated or removed functions
• Script execution timeouts
• Incompatible PHP version for a plugin or theme

3. Exceeding Server Resource Limits

Every hosting environment has defined limits on memory, CPU usage, and execution time. When a script or a surge in traffic pushes resource consumption beyond these thresholds, the server can fail to process requests and return a 500 error.

This is especially common on Shared Web Hosting plans, where resources are distributed among multiple users. If your website regularly hits resource limits, it may be time to consider upgrading to a VPS Hosting plan for dedicated, scalable resources.

4. Incorrect File or Directory Permissions

Linux-based web servers enforce strict file permission rules. If a file or directory has permissions that are too restrictive (or in some cases, too permissive), the server may be unable to read, execute, or write to it — resulting in a 500 error.

Standard permission requirements:

• Files: 644 (owner can read/write; group and public can read)
• Directories: 755 (owner can read/write/execute; group and public can read/execute)
• Executable scripts: 700 or 755 depending on server configuration

5. Faulty, Outdated, or Conflicting Plugins and Themes

If you're running a CMS like WordPress, plugins and themes are among the most frequent causes of 500 errors. A poorly coded plugin, an outdated theme incompatible with your current PHP version, or a conflict between two plugins can all cause the server to fail.

This risk increases significantly when:

• Updating multiple plugins simultaneously
• Installing a new plugin without testing in a staging environment
• Running a PHP version that a plugin no longer supports

6. Exhausted PHP Memory Limit

PHP has a configurable memory limit that determines the maximum amount of RAM a single PHP process can consume. If your website's scripts require more memory than the server has allocated, PHP will terminate the process and the server will return a 500 error.

Default PHP memory limits are often set conservatively (e.g., 64M or 128M), which can be insufficient for feature-rich WordPress sites or complex web applications.

7. Server Misconfiguration

Errors in core server configuration files — such as Apache's httpd.conf, Nginx's nginx.conf, or virtual host configuration files — can prevent the server from processing requests correctly. These issues are more common after server migrations, software upgrades, or manual configuration changes.

If you're managing your own server infrastructure, a Dedicated Server gives you full root access to diagnose and correct configuration-level issues directly.

How to Fix a 500 Internal Server Error: Step-by-Step

Now that you understand the potential causes, let's walk through each fix methodically.

Step 1: Check and Reset the .htaccess File

This should always be your first step, as it's both the most common cause and the easiest to test.

How to do it:

1. Connect to your website via FTP (using FileZilla or a similar client) or through your hosting control panel's File Manager.
2. Navigate to your website's root directory (usually public_html or www).
3. Locate the .htaccess file. Note: it may be hidden — enable "Show Hidden Files" in your FTP client if necessary.
4. Rename the file to something like .htaccess_backup or .htaccess_old.
5. Reload your website in the browser.

Interpreting the result:

• If the 500 error disappears: The .htaccess file was the problem. You can now generate a clean one.
• If the error persists: The .htaccess file is not the cause — move on to the next step.

Generating a new .htaccess file (WordPress):

Log into your WordPress admin dashboard, go to Settings → Permalinks, and click Save Changes without modifying anything. WordPress will automatically regenerate a clean .htaccess file.

Step 2: Increase the PHP Memory Limit

If your site is running out of memory, increasing the PHP memory limit is a straightforward fix.

Method 1: Edit php.ini

Locate your server's php.ini file and find the memory_limit directive:

; Before
memory_limit = 128M

; After
memory_limit = 256M

Save the file and restart your web server.

Method 2: Edit .htaccess

Add the following line to your .htaccess file:

php_value memory_limit 256M

Method 3: Edit wp-config.php (WordPress only)

Open your wp-config.php file and add the following line before the /* That's all, stop editing! */ comment:

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

After making changes, reload your website to verify the error is resolved. If 256M isn't sufficient, try 512M — but if your site consistently requires this much memory, it's worth investigating the underlying cause or upgrading your hosting plan.

Step 3: Verify and Correct File Permissions

Incorrect permissions are a silent but serious cause of 500 errors. Here's how to check and fix them:

Via FTP Client (e.g., FileZilla):

1. Right-click on a file or directory.
2. Select File Permissions or CHMOD.
3. Set the numeric value:

• Files: 644
• Directories: 755

Via SSH (command line):

To fix permissions recursively across your entire website:

# Fix directory permissions
find /var/www/your-site -type d -exec chmod 755 {} ;

# Fix file permissions
find /var/www/your-site -type f -exec chmod 644 {} ;

> Important: Never set files or directories to 777 (world-writable). This is a serious security vulnerability and can also cause 500 errors on some server configurations.

Step 4: Disable Plugins and Themes (WordPress / CMS)

If you're running WordPress or another CMS and suspect a plugin or theme conflict, follow this systematic approach:

Disabling all plugins via FTP (when you can't access the admin dashboard):

1. Connect via FTP and navigate to /wp-content/.
2. Rename the plugins folder to plugins_disabled.
3. Reload your website.
4. If the error is gone, rename the folder back to plugins.
5. Re-enable plugins one at a time through the WordPress dashboard, reloading the site after each activation.
6. The plugin that triggers the 500 error upon activation is your culprit.

Switching to a default theme:

1. Navigate to /wp-content/themes/ via FTP.
2. Rename your active theme's folder (e.g., mytheme → mytheme_disabled).
3. WordPress will automatically fall back to a default theme.
4. If the error resolves, your theme was the cause — contact the theme developer or switch to an updated version.

Step 5: Review Server Error Logs

Server logs are your most powerful diagnostic tool. They record exactly what went wrong and when, often pointing directly to the file, line number, or process responsible for the 500 error.

Where to find error logs:

Enabling WordPress debug logging:

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

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

This will write all PHP errors to /wp-content/debug.log without displaying them to visitors.

What to look for in logs:

PHP Fatal error — indicates a broken script
Permission denied — confirms a file permissions issue
Out of memory — confirms the PHP memory limit is too low
Premature end of script headers — often related to CGI/Perl script issues

If you're using a VPS with cPanel, you can access error logs directly from the cPanel interface without needing SSH access, making diagnostics significantly more accessible.
Step 6: Check for PHP Version Incompatibilities
An often-overlooked cause of 500 errors is a mismatch between your server's PHP version and the PHP version required by your CMS, plugins, or themes.
How to check:

In cPanel, go to Software → Select PHP Version to see your current PHP version.
Check your plugin/theme documentation for supported PHP versions.
WordPress itself publishes its PHP compatibility requirements on the official WordPress.org site.

If you're running PHP 8.x but a plugin was built for PHP 7.x (or vice versa), conflicts can easily cause fatal errors and 500 responses.
Step 7: Contact Your Hosting Provider
If you've worked through all the steps above and the 500 error persists, the issue may be at the infrastructure level — something only your hosting provider can access and resolve.
When contacting support, provide:

The exact URL(s) returning the 500 error
The approximate time the error first appeared
Any recent changes made to the website (plugin updates, code changes, migrations)
Any relevant error log entries you've already found

A quality hosting provider will have access to server-level logs, firewall configurations, and infrastructure diagnostics that go beyond what's available to individual website owners.
Preventing 500 Errors in the Future
Fixing a 500 error is important — but preventing it from happening again is even better. Here are the best practices for long-term stability:
1. Keep Everything Updated
Regularly update your CMS core, plugins, themes, and PHP version. Outdated software is a leading cause of compatibility issues and 500 errors.
2. Use a Staging Environment
Before applying updates or making significant changes to a live website, test them in a staging environment. Many hosting providers offer one-click staging tools.
3. Maintain Regular Backups
Automated daily backups mean that even if a 500 error is caused by a bad update or file corruption, you can restore your site quickly. This is a standard feature on most managed hosting plans.
4. Monitor Server Resources
Use monitoring tools to track CPU usage, memory consumption, and disk I/O. If you're consistently approaching resource limits on shared hosting, upgrading to a VPS Hosting plan will provide the headroom your site needs to operate reliably.
5. Implement SSL and Security Best Practices
Secure your website with a valid SSL Certificate and follow security hardening guidelines for your server and CMS. Malware infections and unauthorized file modifications are another source of unexpected 500 errors.
6. Choose Reliable Hosting Infrastructure
The quality of your hosting environment plays a major role in overall server stability. Hosting your website on a reliable, well-maintained infrastructure reduces the risk of server-side misconfigurations and resource-related failures. If your current hosting environment is causing repeated issues, consider exploring VPS Control Panels for greater control over your server configuration.
Quick Reference: 500 Error Troubleshooting Checklist
Use this checklist to systematically work through a 500 Internal Server Error:

[ ] Rename .htaccess and test — regenerate if it was the cause
[ ] Increase PHP memory limit in php.ini, .htaccess, or wp-config.php

Conclusion

A 500 Internal Server Error is undeniably frustrating — for website owners who need their site online and for visitors who simply want to access content. But it's rarely a catastrophic or permanent problem. In most cases, a methodical approach to troubleshooting will identify the root cause and lead to a resolution within minutes or hours.

The key is to work through the causes systematically: start with the .htaccess file, check memory limits and file permissions, isolate plugin and theme conflicts, and always consult your server error logs for precise diagnostic information.

If your website is experiencing repeated 500 errors or you're finding that your current hosting environment lacks the resources or flexibility needed to keep your site stable, it may be time to consider a more robust hosting solution. AlexHost's VPS Hosting plans offer dedicated resources, full root access, and scalable performance — giving you the control you need to prevent server errors before they impact your visitors.