Fix WordPress 500 Internal Server Error (9 Steps)

Last Updated: April 10, 2026 | By Mike

Table of Contents

• Quick Fix Checklist
• Quick Diagnosis Flow
• What Is the WordPress 500 Internal Server Error?
• Different Variations of the 500 Error in WordPress
• Main Causes of the 500 Internal Server Error
• Who Does This Error Affect?
• How to Fix the 500 Internal Server Error (9 Steps)
• Common Mistakes to Avoid
• Tools to Diagnose WordPress 500 Errors
• How to Prevent WordPress 500 Errors
• Fix 500 Error by Hosting Type
• 500 Error vs Other WordPress Errors
• Frequently Asked Questions
• Conclusion

A WordPress 500 Internal Server Error means the server cannot process a request due to plugin conflicts, PHP memory limits, or .htaccess corruption. The fastest fix is to check your error logs, deactivate plugins one by one, and increase the PHP memory limit to 256 MB in wp-config.php.

Quick Fix Checklist (Fix 500 Error Fast)

Estimated Fix Time: 15–45 minutes | Difficulty: Beginner to Intermediate | Last Tested: WordPress 6.7 + WooCommerce 9.6

If you need to get your site back online quickly, work through this checklist in order. Each step takes under five minutes and eliminates the most common causes.

1. Check error logs — Open cPanel > Metrics > Errors or connect via SSH and run tail -50 ~/public_html/wp-content/debug.log
2. Rename .htaccess — Connect via FTP, rename .htaccess to .htaccess_backup, and reload your site
3. Deactivate all plugins — Rename wp-content/plugins to plugins_disabled via FTP
4. Increase PHP memory — Add define('WP_MEMORY_LIMIT', '256M'); to wp-config.php
5. Switch to Twenty Twenty-Four — Rename your active theme folder via FTP

If any of these steps resolves the error, read the detailed walkthrough below to understand why it happened and how to prevent it from recurring.

Quick Diagnosis: Match Your Situation to the Fix

Not every WordPress 500 error has the same root cause. Use this diagnosis table to jump straight to the most likely fix based on when your error started.

What Is the WordPress 500 Internal Server Error?

The WordPress 500 Internal Server Error is an HTTP status code meaning the server failed to fulfill a request due to an unexpected condition. Unlike a 404 error that points to a missing page, the 500 error gives no specific clue about what went wrong. It simply tells you the server hit a problem it could not handle.

According to WordPress.org debugging documentation, enabling WP_DEBUG in your wp-config.php file is the first step toward identifying the root cause. WooHelpDesk users commonly report this error after updating plugins, switching themes, or migrating servers. Based on support cases we have handled, roughly 70% of WordPress 500 errors trace back to plugin conflicts or exhausted PHP memory.

The error can appear as a white screen, a brief server message, or a custom error page depending on your hosting environment. On shared hosting plans, PHP resource limits are typically lower, making 500 errors more frequent during traffic spikes or heavy cron job execution.

Different Variations of the 500 Error in WordPress

The 500 Internal Server Error does not always display the same message. Depending on your server software, hosting provider, and WordPress configuration, you may see different variations. Recognizing which version you are dealing with helps narrow down the cause faster.

• 500 Internal Server Error — The standard message from Apache or Nginx when no more specific error applies.
• HTTP Error 500 — A generic browser-displayed variant. Common in Chrome and Edge when the server returns no custom error page.
• WordPress White Screen of Death — The page loads completely blank with no error text. This often indicates a PHP fatal error with WP_DEBUG_DISPLAY set to false.
• “There has been a critical error on this website” — WordPress 5.2+ displays this recovery mode message instead of a blank screen. Check your admin email for a recovery link.
• 500 Error in wp-admin Only — If the front end loads but the dashboard throws a 500 error, the cause is usually a plugin that runs admin-specific code or a corrupted wp-options table row like active_plugins.
• Intermittent 500 Errors — If the error appears and disappears randomly, look at server resource limits. Shared hosting plans often hit CPU throttling during peak hours.

Main Causes of the 500 Internal Server Error

The 500 error can stem from several server-side issues. Here are the seven most frequent triggers we encounter in WordPress and WooCommerce support cases.

1. Plugin or Theme Conflicts

A faulty plugin update or theme incompatibility can crash your site. This is the single most common cause we see at WooHelpDesk. For example, updating a caching plugin while running an incompatible PHP version often triggers an immediate fatal error. Outdated hooks and deprecated function calls in older plugins are frequent culprits, especially when WordPress core updates ahead of the plugin ecosystem.

2. Exhausted PHP Memory

WordPress defaults to 64 MB of PHP memory. Heavy plugins like WooCommerce, Elementor, page builders, or analytics tools can exceed this limit during complex operations. A WooCommerce store processing bulk orders or running product imports regularly pushes past the default memory allocation. Symptoms include the site working normally for lightweight pages but crashing on resource-intensive admin screens or checkout flows.

3. Corrupted .htaccess File

Broken rewrite rules in the .htaccess file trigger server errors instantly. Even a misplaced character can cause a 500 error. Security plugins, permalink changes, and manual edits are the most common reasons for .htaccess corruption. Some plugins write complex redirect rules that conflict with your hosting provider’s default server configuration.

4. Server Configuration Errors

Incorrect file permissions (anything other than 755 for directories, 644 for files) or misconfigured PHP versions cause failures. Running PHP 7.4 when a plugin requires PHP 8.0+ triggers compatibility errors that manifest as 500 responses. Similarly, missing PHP extensions like mbstring or xml can prevent WordPress from loading.

5. Database Problems

Corrupted database tables prevent WordPress from reading or writing data, producing server errors on any page that queries affected tables. The wp_options table is especially vulnerable because every page load queries it. A corrupted wp_options row can bring down the entire site.

6. PHP Syntax Errors

A typo in your theme’s functions.php or a plugin file can halt PHP execution entirely. This commonly happens when users paste code snippets from tutorials without verifying the PHP version compatibility. A missing semicolon, unclosed bracket, or deprecated function call can take down the whole site.

7. Hosting Server Overload

Shared hosting plans that run out of CPU or memory resources under traffic spikes will throw 500 errors. If your site receives a sudden surge in traffic from a social media post or marketing campaign, the server may throttle or kill PHP processes to protect other accounts on the same server.

Who Does This Error Affect?

The 500 Internal Server Error affects every type of WordPress user, but the severity depends on your site type and traffic volume.

WooCommerce store owners feel the impact hardest. A 500 error during checkout blocks customers from completing purchases. If your WooCommerce checkout page is not working, the 500 error is one of the most common underlying causes. Based on WooHelpDesk support data, a WooCommerce store experiencing a 500 error during peak hours can lose 20–30% of potential conversions for every hour of downtime. Cart abandonment spikes because returning customers encounter the error and leave without retrying.

Membership and subscription sites face login failures and content access issues. Members who cannot access gated content are likely to cancel their subscriptions, creating recurring revenue losses that compound over time.

Content publishers and bloggers risk search ranking drops. Google reattempts crawling failed pages, but persistent 500 errors cause Googlebot to reduce crawl frequency and eventually deindex affected URLs. A site returning 500 errors for more than 48 hours typically sees noticeable ranking drops within a week.

Agency teams managing multiple WordPress installations encounter this after batch plugin updates across client sites. If you run a WooCommerce store with checkout issues, the 500 error can compound existing problems and block customers entirely.

How to Fix the 500 Internal Server Error (9 Steps)

Work through these steps in order. Each one eliminates a potential cause, narrowing down the problem systematically.

Step 1: Check Server Error Logs

When to use: Always start here. The error log pinpoints the exact file and line number causing the failure.

Your server error log contains the exact PHP error or misconfiguration causing the 500 response. Access it through your hosting control panel (cPanel, Plesk) or via SSH. Look for entries timestamped around when the error started.

Common log entries include “PHP Fatal error: Allowed memory size exhausted” or “PHP Parse error: syntax error.” If you use cPanel, navigate to Metrics > Errors to see the most recent entries. For SSH access, run tail -100 /home/username/public_html/wp-content/debug.log to read the last 100 lines.

Expected result: You identify the specific PHP error, plugin file, or configuration issue causing the 500 response.

Step 2: Increase the PHP Memory Limit

When to use: If the error log shows “Allowed memory size exhausted” or your site crashes on resource-heavy pages like WooCommerce checkout or admin dashboards.

Open your wp-config.php file via FTP or File Manager. Add this line just before “That’s all, stop editing”:

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

Alternatively, add php_value memory_limit 256M to the top of your .htaccess file. Save, upload, and test your site. If the error disappears, your site was running out of memory. Consider optimizing your plugins or upgrading your hosting plan to prevent recurrence.

Expected result: The 500 error resolves immediately if PHP memory exhaustion was the cause. Your error log stops showing memory-related fatal errors.

Step 3: Regenerate the .htaccess File

When to use: If the 500 error appeared after changing permalink settings, installing a security or caching plugin, or manually editing server configuration files.

Rename your current .htaccess file to .htaccess_backup via FTP. Then log into your WordPress dashboard, go to Settings > Permalinks, and click Save Changes. WordPress generates a fresh .htaccess file automatically.

If you cannot access the dashboard, create a new .htaccess file with these default WordPress rewrite rules:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Expected result: If a corrupted .htaccess was the cause, your site loads immediately after renaming the file.

Step 4: Deactivate All Plugins

When to use: If the error started after a plugin update or installation, or if error logs point to a file inside wp-content/plugins/.

If you can access the dashboard, go to Plugins > Installed Plugins, select all, and choose Deactivate from the bulk actions dropdown. If you cannot access the dashboard, connect via FTP and rename the wp-content/plugins folder to plugins_disabled.

This deactivates every plugin at once. If the error stops, rename the folder back and reactivate plugins one at a time until the error returns. That last activated plugin is the culprit. On WooCommerce sites, pay special attention to payment gateway plugins, shipping calculators, and tax plugins — these run complex server-side logic that frequently conflicts with caching or optimization plugins.

Expected result: If a plugin conflict is the cause, the site loads normally with all plugins disabled. Reactivating one at a time reveals the specific plugin causing the failure.

Step 5: Switch to a Default Theme

When to use: If deactivating plugins did not resolve the error, or if the error log points to a file inside your active theme’s directory.

Activate Twenty Twenty-Four or another default WordPress theme from Appearance > Themes. If you cannot reach the dashboard, rename your active theme folder via FTP. WordPress falls back to the latest default theme automatically.

If this fixes the error, your theme has a bug or conflict. Contact the theme developer or check for an available update. Custom themes with heavy functions.php files or themes that bundle outdated libraries are the most common offenders.

Expected result: The site loads with the default theme, confirming the previous theme was the cause of the 500 error.

Step 6: Verify File Permissions

When to use: If the error persists after checking plugins and themes, or if you recently migrated the site to a new server or changed hosting providers.

Using your FTP client (FileZilla, WinSCP), check permissions on your WordPress directories. Directories should be set to 755. Files should be 644. The wp-config.php file should be 440 or 400 for extra security.

Incorrect permissions, especially overly permissive ones like 777, create both errors and security vulnerabilities. After a server migration, file ownership can also change, so verify that the web server user (typically www-data or nobody) has proper read access.

Expected result: Correcting permissions restores server access to all WordPress files and directories.

Step 7: Repair the Database

When to use: If the error appears on specific pages that rely on database queries, or if the error log mentions table corruption or failed queries.

Add define('WP_ALLOW_REPAIR', true); to wp-config.php, then visit yoursite.com/wp-admin/maint/repair.php. Click Repair Database. Alternatively, use phpMyAdmin to select all tables and run the Repair operation.

Remove the repair line from wp-config.php once finished. If you experience frequent fatal errors in WordPress, database corruption could be a recurring factor worth investigating with your hosting provider.

Expected result: Corrupted tables are repaired and pages that previously threw 500 errors load normally again.

Step 8: Update WordPress Core, Themes, and Plugins

When to use: If you are running outdated WordPress core, themes, or plugins, especially if your PHP version has been upgraded recently by your host.

Outdated software is a top cause of compatibility failures. Update WordPress core first, then themes, then plugins. Always take a full backup before updating. WooHelpDesk handles hundreds of update-related support tickets monthly, and we consistently find that sites running outdated PHP versions (below 8.0) experience significantly more 500 errors due to deprecated function calls and removed features.

Expected result: Updating to the latest compatible versions resolves conflicts caused by deprecated code and ensures all components work with your current PHP version.

Step 9: Contact Your Hosting Provider

When to use: If none of the above steps resolve the error. The issue likely sits at the server level beyond your WordPress installation.

Contact your host’s support team and provide them the error log entries you found in Step 1. Ask specifically about PHP version compatibility, server resource limits, and any recent server-side changes. Managed WordPress hosts like Kinsta, WP Engine, and SiteGround can usually diagnose server-level 500 errors within minutes because they have access to server logs and configuration that shared hosting control panels do not expose.

Expected result: Your host identifies and resolves the server-level issue, such as a misconfigured PHP module, exceeded resource limit, or firewall rule blocking requests.

Common Mistakes to Avoid When Fixing Error 500

Troubleshooting under pressure leads to mistakes that can make things worse. Avoid these pitfalls:

Skipping the backup step. Always create a full backup (files + database) before making changes. A single bad edit to wp-config.php without a backup can leave you locked out completely.

Setting file permissions to 777. This opens your site to anyone. Never use 777 on a production WordPress site. Stick with 755 for directories and 644 for files.

Blindly increasing PHP memory. Raising the memory limit masks the real problem. Investigate which plugin or process is consuming excessive memory rather than just throwing more resources at it. Use the WP_DEBUG_LOG to trace memory-intensive operations.

Editing theme or plugin files directly on the live site. Use a staging environment or local copy first. One syntax error in functions.php can take down your entire site.

Ignoring the error log. The log almost always points to the specific file and line causing the failure. Skipping this step means you are guessing instead of diagnosing.

Reactivating all plugins at once after deactivation. Reactivate them one at a time. Bulk reactivation defeats the purpose of isolating the problematic plugin.

Tools to Diagnose WordPress 500 Errors

When manual troubleshooting does not reveal the root cause, dedicated diagnostic tools can pinpoint the failing component in minutes. These tools give you server-level visibility that error logs alone may miss.

Query Monitor Plugin

Query Monitor is a free WordPress plugin that displays database queries, PHP errors, hooks, and HTTP API calls directly in the admin toolbar. Install it, reproduce the 500 error, and check the PHP Errors panel for the exact file and line number triggering the failure. It is especially useful for catching slow database queries on WooCommerce stores that run complex product filters.

WP Debug Log

Enabling WP_DEBUG_LOG writes every PHP warning, notice, and fatal error to wp-content/debug.log. Unlike the browser screen, this log captures errors that happen during AJAX requests, REST API calls, and WP-Cron jobs. If your 500 error is intermittent, keep WP_DEBUG_LOG enabled for 24 hours and review the log for patterns. Refer to the PHP error reporting documentation for granular control over which error levels get logged.

Server-Level Monitoring Tools

For persistent or hard-to-reproduce 500 errors, server-level tools provide deeper visibility:

New Relic APM traces every PHP transaction from request to response, highlighting slow functions and memory spikes. Many managed WordPress hosts include New Relic integration at no extra cost.

PHP-FPM Status Page shows active PHP processes, their execution time, and memory usage. If PHP-FPM workers are maxed out, incoming requests queue up and eventually return 500 errors. Ask your host to enable the PHP-FPM status endpoint so you can monitor worker saturation during traffic spikes.

Hosting Error Log Viewers in cPanel (Metrics > Errors) or Plesk (Domains > Logs) aggregate Apache and Nginx errors in one place. If you are troubleshooting Stripe webhook delivery failures that coincide with 500 errors, cross-referencing the webhook timestamps with your server error log often reveals the conflicting process.

How to Prevent WordPress 500 Errors

Fixing a 500 error once is not enough. Preventing recurrence saves hours of future downtime and protects your search rankings.

Use a staging environment for all updates. Test plugin and theme updates on a staging copy before applying them to your live site. Most managed WordPress hosts provide one-click staging. If yours does not, plugins like WP Staging create local clones for testing.

Set up uptime monitoring. Services like UptimeRobot or Jetpack Monitor check your site every few minutes and alert you immediately when a 500 error occurs. Early detection means faster resolution and less SEO damage.

Keep PHP updated. Run PHP 8.1 or 8.2 on your server. Each PHP version brings performance improvements and security patches. Older PHP versions are more likely to trigger memory exhaustion and compatibility errors with modern plugins.

Schedule regular backups. Automated daily backups through UpdraftPlus, BlogVault, or your hosting provider ensure you can roll back within minutes if an update causes a 500 error.

Audit plugins quarterly. Remove plugins you no longer use. Each active plugin adds PHP execution overhead and increases the risk of conflicts. WooHelpDesk recommends keeping active plugins under 25 for optimal performance on most hosting plans.

Monitor PHP error logs weekly. Non-fatal PHP warnings and notices often escalate into 500 errors after a WordPress or PHP version update. Catching warnings early lets you address compatibility issues before they cause downtime.

Fix WordPress 500 Error by Hosting Type

The WordPress 500 internal server error manifests differently depending on your hosting environment. Each platform has unique configuration files, resource limits, and troubleshooting paths. Here is how to approach the HTTP error 500 fix based on your specific hosting stack.

Apache Servers (Shared Hosting)

Apache reads .htaccess on every request, making it the most common trigger for 500 errors. Rename .htaccess via FTP to test immediately. Check error_log in your site root or ~/logs/error.log for the specific PHP fatal error. On cPanel hosts, navigate to MultiPHP INI Editor to adjust memory_limit, max_execution_time, and upload_max_filesize without editing files directly.

Nginx Servers

Nginx does not use .htaccess files, so rewrite-rule corruption is not a factor. Instead, check /var/log/nginx/error.log for upstream timeout or connection refused messages. Common Nginx-specific causes include fastcgi_read_timeout being too low, client_max_body_size blocking large file uploads, and PHP-FPM worker pools running out of available processes during traffic spikes.

Managed WordPress Hosting (Kinsta, WP Engine, SiteGround)

Managed hosts handle server configuration internally, so the fix usually involves their support dashboard or support team. Kinsta users should check the MyKinsta log viewer and clear the server-level cache. WP Engine users can flush the object cache and Varnish cache from the WP Engine plugin in the dashboard. SiteGround users should access Site Tools and check the Error Log under Statistics. Most managed hosts resolve server-level 500 errors within minutes because they have direct access to configuration files you cannot reach on shared plans.

Shared Hosting Resource Limits

Shared hosting plans throttle CPU and memory per account. During peak traffic or heavy WP-Cron execution, your account hits the provider resource ceiling and PHP processes get killed, returning a 500 error. Check your cPanel Resource Usage page (under Metrics) to see if you are hitting limits. If resource spikes correlate with your 500 errors, consider upgrading to VPS or managed hosting. WooHelpDesk support data shows that roughly 40% of persistent 500 errors on shared hosting resolve permanently after upgrading to a managed plan with dedicated PHP workers.

500 Error vs Other WordPress Errors

If you are seeing signs that your WordPress site has been hacked, what looks like a 500 error could actually be caused by malicious code injected into your theme files or .htaccess.

Frequently Asked Questions

How do I fix a 500 Internal Server Error in WordPress?

Start by checking your server error logs to identify the exact cause. Then try deactivating all plugins, switching to a default theme, regenerating your .htaccess file, and increasing your PHP memory limit to 256 MB. Work through each step systematically to isolate the exact cause rather than making multiple changes at once.

Why does my WordPress site show a 500 error after updating a plugin?

The updated plugin likely has a compatibility conflict with your WordPress version, PHP version, or another active plugin. Deactivate the recently updated plugin via FTP by renaming its folder inside wp-content/plugins. If the site recovers, check with the plugin developer for a fix or look for an alternative plugin.

Can a corrupted .htaccess file cause a 500 error?

Yes. The .htaccess file controls URL rewriting and server behavior on Apache servers. A single misplaced directive or syntax error triggers an immediate 500 error. Rename the file via FTP and regenerate it through Settings > Permalinks to fix it.

What PHP memory limit should I set for WordPress?

WordPress recommends at least 128 MB. WooCommerce sites and sites with multiple active plugins should set 256 MB. You can set this in wp-config.php with define('WP_MEMORY_LIMIT', '256M'); or in php.ini if your host allows direct PHP configuration.

Does the 500 error affect my SEO rankings?

Yes, if left unresolved. Google reattempts crawling, but persistent 500 errors cause Google to reduce crawl frequency and eventually drop affected pages from the index. Fixing the error quickly and submitting a recrawl request through Google Search Console prevents lasting SEO damage.

How do I enable WP_DEBUG to troubleshoot the 500 error?

Open wp-config.php and add three lines: define('WP_DEBUG', true); followed by define('WP_DEBUG_LOG', true); and define('WP_DEBUG_DISPLAY', false);. This writes errors to wp-content/debug.log without showing them to visitors. Check this log file for the exact PHP error causing the 500 response.

What causes a 500 error in wp-admin only?

A 500 error limited to wp-admin usually indicates a plugin that runs admin-specific code, a corrupted active_plugins row in the wp_options database table, or insufficient PHP memory for dashboard operations. Deactivate plugins via FTP and check your database using phpMyAdmin to inspect the wp_options table for corrupted serialized data.

How do I fix a 500 error after migrating WordPress?

After a WordPress migration, 500 errors commonly stem from incorrect file permissions, mismatched PHP versions between old and new servers, or hardcoded paths in the .htaccess file. Verify file permissions (755 for directories, 644 for files), confirm your new server runs the same or newer PHP version, and regenerate the .htaccess file through Settings > Permalinks.

Can a CDN cause a 500 internal server error?

A CDN itself rarely causes a 500 error, but misconfigured CDN settings can trigger one. Incorrect SSL settings (mixed content), aggressive caching of dynamic pages, or CDN firewall rules blocking legitimate requests to wp-admin or wp-cron.php are common culprits. Temporarily bypass the CDN by pointing your domain directly to your server IP to test whether the CDN is involved.
Why does WordPress show a blank white screen instead of a 500 error?

A blank white screen, often called the White Screen of Death, occurs when PHP encounters a fatal error but WP_DEBUG_DISPLAY is set to false. WordPress suppresses the error message to avoid exposing server details to visitors. Enable WP_DEBUG and WP_DEBUG_LOG in wp-config.php to capture the error in wp-content/debug.log without displaying it publicly.

How do I fix a 500 error without FTP access?

If you cannot connect via FTP, use your hosting control panel File Manager to rename the plugins folder or .htaccess file. Most hosts (cPanel, Plesk, hPanel) provide a browser-based file manager under the Files section. You can also ask your hosting support team to deactivate plugins or reset file permissions on your behalf.

Can low disk space cause a WordPress 500 error?

Yes. When your server runs out of disk space, PHP cannot write temporary files, session data, or error logs, which triggers a 500 Internal Server Error. Check your disk usage in cPanel under Disk Usage or run df -h via SSH. Delete old backups, clear the trash folder, and remove unused themes or plugins to free space. WooCommerce stores that generate large log files in wp-content/uploads/wc-logs are especially prone to this issue.

Conclusion

The WordPress 500 Internal Server Error is frustrating, but it follows a predictable troubleshooting path. Check your error logs first, then work through plugin deactivation, .htaccess regeneration, memory limits, file permissions, and database repair. Most cases resolve within the first four steps.

If your WooCommerce store or WordPress site continues to throw 500 errors despite following every step above, WooHelpDesk offers expert WordPress troubleshooting support. Our team resolves most server errors within 30 minutes and can prevent future recurrences through proactive monitoring and maintenance.