A WordPress 500 Internal Server Error can be one of the most frustrating problems to encounter because the message usually does not tell you what actually went wrong. Instead of showing a specific cause, WordPress or your web server simply reports that something prevented the request from being completed.
The good news is that a 500 error does not necessarily mean your website is permanently broken. In many cases, the problem is caused by a plugin conflict, corrupted .htaccess file, PHP memory limit, incompatible PHP version, theme issue, or a server configuration problem that can be identified and fixed.
In this complete guide, you’ll learn how to fix the WordPress 500 Internal Server Error step by step, starting with the safest and easiest solutions before moving into more advanced troubleshooting.
What Is a 500 Internal Server Error in WordPress?
A 500 Internal Server Error is a server-side error that occurs when your web server cannot successfully complete a request.
Unlike a 404 error, which usually means a specific page cannot be found, a 500 error generally indicates that something went wrong while the server was processing the request.
You might see messages such as:
500 Internal Server ErrorHTTP 500 Internal Server ErrorThe server encountered an internal errorThis page isn't workingHTTP ERROR 500
The exact message depends on your hosting provider, web server, browser, and configuration.
The important thing to understand is that the 500 error itself is usually a symptom rather than the root cause.
Why Does WordPress Show a 500 Internal Server Error?
There are several possible causes of a WordPress 500 error.
The most common include:
- A faulty or incompatible plugin
- A theme conflict
- A corrupted
.htaccessfile - PHP memory exhaustion
- An incompatible PHP version
- A PHP fatal error
- Incorrect file or folder permissions
- Corrupted WordPress core files
- Server configuration problems
- Hosting resource limitations
- Problems caused by custom PHP code
- Failed or incomplete updates
Because there are so many possible causes, the best approach is to troubleshoot the problem systematically rather than randomly changing settings.
Before You Start: Make a Backup
Before making significant changes to your WordPress installation, create a backup of your website.
Ideally, your backup should include:
- WordPress files
wp-content- Plugins
- Themes
- Uploads
- Database
- Custom configuration files
If your hosting provider offers automatic backups or snapshots, create a fresh backup before troubleshooting.
This is especially important if you are going to edit .htaccess, modify PHP configuration, disable plugins manually, or change server settings.
If you regularly make changes to your WordPress website, a staging environment is also extremely useful. You can learn more about safely testing WordPress changes in our WordPress staging environment guide.
Clear Your Browser and Website Cache
Before making technical changes, determine whether the error is actually persistent.
Try:
- Refreshing the page
- Opening the website in an incognito/private window
- Testing another browser
- Testing another device
- Clearing your browser cache
- Clearing your WordPress caching plugin
- Clearing your hosting cache
- Clearing your CDN cache if you use one
If the website works in an incognito window but not in your normal browser, the problem may be related to cached browser data rather than WordPress itself.
However, if the 500 error appears consistently across different browsers and devices, continue troubleshooting.
Check Whether the Entire Website Is Down
First determine the scope of the problem.
Try opening:
https://yourdomain.com
Then test:
https://yourdomain.com/wp-admin/
and a few different pages.
If everything returns a 500 error
The problem is likely related to something global, such as:
.htaccess- PHP configuration
- PHP version
- server resources
- WordPress core
- a plugin loaded on every request
- hosting configuration
If only one page returns a 500 error
The problem may be related to:
- that page’s content
- a specific plugin
- custom code
- a page builder
- database data
- a template
This distinction can significantly narrow down the troubleshooting process.
Disable WordPress Plugins
One of the most common causes of WordPress 500 errors is a plugin conflict or PHP fatal error caused by a plugin.
If you can still access the WordPress dashboard, go to:
Plugins → Installed Plugins
Deactivate all plugins temporarily.
Then test your website again.
If the website starts working
You’ve likely identified a plugin-related problem.
Reactivate the plugins one at a time, testing the website after each activation.
When the 500 error returns, the last plugin you activated is a strong candidate.
If You Cannot Access WordPress Admin
You can disable plugins manually through your hosting file manager or FTP.
Open:
/wp-content/
Find:
plugins
Rename it to something such as:
plugins-disabled
Then test the website.
If the website starts working, WordPress can no longer load the plugins, confirming that a plugin is likely responsible.
You can then restore the folder name and troubleshoot individual plugins.
Check for a Theme Conflict
If plugins are not responsible, your active theme may be causing the problem.
If you can access the WordPress dashboard, temporarily switch to a default WordPress theme.
For example, use one of the current default themes available on your installation.
Then test the website.
If the 500 error disappears, the problem may be caused by:
- custom theme code
- outdated theme functionality
- an incompatible theme update
- PHP compatibility issues
- a theme dependency
Theme and plugin conflicts can sometimes be difficult to identify because the error may only occur on specific pages.
For a more detailed troubleshooting process, see our guide on how to diagnose and resolve WordPress plugin and theme conflicts.
Regenerate the .htaccess File
A corrupted .htaccess file is another common cause of WordPress 500 errors, especially after:
- plugin installations
- server migrations
- permalink changes
- security configuration changes
- manual server modifications
First, access your website files through your hosting file manager or FTP.
Find:
.htaccess
Because this is an important configuration file, make a backup before changing it.
Rename it temporarily to something like:
.htaccess-old
Then try loading your website.
If the website starts working, the .htaccess file was probably responsible.
Generate a New .htaccess File
If you can access WordPress:
Settings → Permalinks
You don’t necessarily need to change anything.
Click Save Changes.
WordPress will attempt to regenerate the default rewrite rules.
Test your website again.
Increase the WordPress PHP Memory Limit
A 500 error can occur when WordPress or a PHP process runs out of available memory.
This can happen when you have:
- large plugins
- WooCommerce
- page builders
- complex themes
- large imports
- image processing
- heavy database queries
- multiple plugins running simultaneously
You may see a message such as:
Allowed memory size exhausted
If so, increasing the available PHP memory may resolve the issue.
Depending on your hosting environment, memory can be configured through:
wp-config.php- PHP configuration
- hosting control panel
.user.iniphp.ini
For example, WordPress may use:
define( 'WP_MEMORY_LIMIT', '256M' );
However, don’t blindly increase memory indefinitely.
If a plugin or custom script is consuming excessive resources, increasing the limit may only hide the underlying problem.
Check Your PHP Version
An outdated or incompatible PHP version can cause fatal errors that result in a 500 response.
Check which PHP version your website is currently using through your hosting control panel.
Then consider whether the error started after:
- changing PHP versions
- updating WordPress
- updating a plugin
- updating your theme
- migrating the website
Older plugins and themes can sometimes contain code that is incompatible with newer PHP versions.
On the other hand, using an outdated PHP version can create compatibility, performance, and security problems.
Before changing PHP versions on a production website, test the change on staging whenever possible.
Enable WordPress Debugging
If the previous solutions did not identify the problem, WordPress debugging can provide much more useful information.
Open:
wp-config.php
Find:
define( 'WP_DEBUG', false );
For troubleshooting, you can temporarily change it to:
define( 'WP_DEBUG', true );
You can also log errors without displaying them publicly:
define( 'WP_DEBUG', true );define( 'WP_DEBUG_LOG', true );define( 'WP_DEBUG_DISPLAY', false );
WordPress can then record errors in:
/wp-content/debug.log
Look for messages containing:
Fatal errorUncaught ErrorAllowed memory size- plugin names
- theme names
- PHP file paths
For example, if the log points directly to:
/wp-content/plugins/example-plugin/
you have a strong indication that the plugin is responsible.
Important
Do not leave debugging enabled unnecessarily on a production website.
Once troubleshooting is complete, disable it again:
define( 'WP_DEBUG', false );
Check the Server Error Logs
Sometimes WordPress debugging doesn’t provide enough information.
Your hosting provider’s server logs can reveal the actual reason the server returned a 500 response.
Depending on your host, you may find logs through a hosting dashboard or server control panel.
Look for:
- PHP fatal errors
- memory errors
- permission errors
- timeout errors
- syntax errors
- server configuration errors
- resource limits
The exact location of these logs depends on your hosting environment.
If you’re not sure where to find them, contact your hosting provider and ask them to check the server error logs for the exact timestamp when the 500 error occurred.
Check File and Folder Permissions
Incorrect file permissions can prevent WordPress or PHP from accessing necessary files.
Typical WordPress installations commonly use permissions similar to:
Files:
644
Directories:
755
The exact permissions can vary depending on your server configuration, so don’t change everything blindly.
If permissions were recently modified during a migration or manual file transfer, they are worth investigating.
Re-upload WordPress Core Files
If you suspect that WordPress core files have become corrupted, you can replace the core files with fresh copies.
This can happen after:
- failed updates
- incomplete migrations
- corrupted files
- interrupted installations
- server problems
You generally want to replace the WordPress core files without overwriting:
wp-content
or:
wp-config.php
Be careful when doing this manually and always maintain a backup first.
If you’re unsure, using the WordPress dashboard’s built-in update/reinstallation functionality or asking your hosting provider for assistance may be safer.
Check Custom PHP Code and Code Snippets
Custom PHP code can also cause a 500 error.
This is especially important if the error appeared immediately after:
- adding a code snippet
- editing
functions.php - modifying a custom plugin
- changing a theme
- adding custom functionality
A PHP syntax error can prevent WordPress from loading correctly.
If you recently added custom code, temporarily remove or disable that code and test the website again.
If you’re using a code snippets plugin, disable the relevant snippet rather than deleting it immediately.
Check Your Hosting Resource Limits
Sometimes the WordPress installation itself is not the problem.
Your hosting account may have reached a resource limit.
Depending on the hosting provider, this could include:
- PHP workers
- CPU
- RAM
- processes
- disk space
- inode limits
- execution time
- concurrent connections
This is particularly important for busy WooCommerce websites or websites with resource-intensive plugins.
If the website frequently becomes unavailable under load, increasing PHP memory alone may not solve the issue.
In that situation, review your hosting resource usage and server logs.
Check Whether the Error Started After an Update
Think about what changed immediately before the 500 error appeared.
Ask yourself:
What changed?
For example:
- WordPress update
- Plugin update
- Theme update
- PHP update
- Hosting migration
- DNS change
- SSL configuration
- New custom code
- New caching plugin
- Security plugin configuration
If the timing is clear, start troubleshooting that change first.
For example:
Plugin updated → website immediately shows 500 → disable plugin → website works.
That’s a much stronger diagnostic signal than randomly changing five different settings.
Restore a Backup If Necessary
If you have tried the troubleshooting steps above and the website remains broken, restoring a recent backup may be the fastest solution.
However, don’t immediately restore without understanding what caused the problem.
Otherwise, you may restore the site and then recreate the same problem when you repeat the change that caused it.
Before restoring, determine:
- When did the error start?
- What changed immediately before it?
- Which backup was created before the problem?
- Does the backup contain the latest customer/order/data information?
For WooCommerce websites especially, restoring an old database can potentially remove newer orders or customer information.
How to Find the Exact Cause of a WordPress 500 Error
If you want to troubleshoot the problem efficiently, use this sequence:
Step 1
Check whether the entire website or only one page is affected.
Step 2
Clear caches and test in an incognito browser.
Step 3
Disable plugins.
Step 4
Switch to a default theme.
Step 5
Regenerate .htaccess.
Step 6
Check PHP version and memory limits.
Step 7
Enable WordPress debugging and inspect debug.log.
Step 8
Check hosting/server error logs.
Step 9
Investigate recent changes.
Step 10
Restore a backup or contact hosting support if necessary.
This approach is much safer than changing multiple settings simultaneously because you can identify which change actually fixed the problem.
What If You Can’t Access WordPress Admin?
You can still troubleshoot a WordPress 500 error.
Use your hosting file manager or FTP to access:
/wp-content/
From there you can:
- rename the plugins folder
- inspect themes
- access debug logs
- modify
.htaccess - inspect files
- disable problematic code
You can also use your hosting control panel to:
- change PHP versions
- review resource usage
- inspect server logs
- create backups
- manage PHP settings
If you have SSH access, additional diagnostic commands may also be available, but these depend heavily on your hosting environment.
WordPress 500 Error vs Other Common WordPress Errors
It’s useful to understand how a 500 error differs from other problems.
| Error | Common Meaning |
|---|---|
| 500 Internal Server Error | Server/PHP-side problem |
| 404 Not Found | Requested page/resource doesn’t exist |
| 403 Forbidden | Server refuses access |
| 502 Bad Gateway | Gateway/proxy received an invalid response |
| 503 Service Unavailable | Server temporarily unavailable or overloaded |
| 504 Gateway Timeout | Server/proxy waited too long for a response |
Understanding the difference can help you choose the correct troubleshooting strategy.
How to Prevent WordPress 500 Errors
You can’t prevent every server error, but you can significantly reduce the risk.
Keep WordPress Updated
Regularly update:
- WordPress core
- Plugins
- Themes
- PHP
However, don’t blindly update everything on a critical production website.
Use a staging environment when possible.
Our WordPress staging guide explains how to test updates before applying them to your live website.
Use Reliable Plugins
Avoid installing unnecessary plugins and remove plugins you no longer use.
Poorly maintained or incompatible plugins can introduce PHP errors and conflicts.
Maintain Regular Backups
Your backup strategy should include both your WordPress files and database.
A backup is especially important before:
- major updates
- migrations
- PHP changes
- theme changes
- plugin changes
- custom development
Monitor Website Performance
Performance problems and resource limits can sometimes contribute to server errors.
Use your hosting dashboard and WordPress performance tools to monitor resource usage.
You can also use our complete WordPress speed optimization guide to improve website performance.
Frequently Asked Questions
Can a plugin cause a WordPress 500 Internal Server Error?
Yes. A plugin can trigger a PHP fatal error, memory exhaustion, compatibility problem, or other server-side issue that results in a 500 response.
Disabling plugins is therefore one of the first troubleshooting steps you should try.
Can .htaccess cause a 500 error?
Yes. A corrupted or incorrectly configured .htaccess file can cause server configuration errors and prevent WordPress pages from loading.
Can PHP cause a WordPress 500 error?
Yes. PHP fatal errors, incompatible PHP versions, memory limits, syntax errors, and incompatible code can all cause a 500 response.
Will increasing PHP memory fix a 500 error?
Sometimes, but not always. If the problem is caused by memory exhaustion, increasing the PHP memory limit can help. If the underlying problem is a plugin, theme, or code error, increasing memory won’t fix the real cause.
What should I do if I cannot access wp-admin?
Use your hosting file manager or FTP to disable plugins, inspect .htaccess, access logs, and troubleshoot the site’s files. Your hosting provider can also help identify server-level problems.
Does a 500 error mean my WordPress website has been hacked?
Not necessarily. A 500 error has many possible causes, including plugins, themes, PHP errors, configuration problems, and resource limits.
However, if the error appeared alongside suspicious redirects, unfamiliar files, new admin users, or other unusual behavior, you should investigate your website security.
If security is a concern, see our WordPress security guide.
Final Thoughts
A WordPress 500 Internal Server Error can look serious, but in many cases it is caused by a specific configuration, plugin, theme, PHP, or server problem that can be identified with a systematic troubleshooting process.
Start with the simplest checks: clear the cache, determine the scope of the error, disable plugins, test the theme, and regenerate .htaccess. If those steps don’t solve the problem, move deeper into PHP configuration, WordPress debugging, server logs, and hosting resources.
The most important rule is to change one thing at a time. That makes it much easier to identify the actual cause instead of accidentally introducing another problem while troubleshooting.
With regular backups, staging, updates, reliable hosting, and proper WordPress maintenance, you can also reduce the chances of serious errors affecting your live website.
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Written by Nemanja Stosic
WordPress Developer & Website Optimization Specialist
Nemanja helps businesses and freelancers build, optimize, and maintain professional WordPress websites focused on performance, SEO, security, and usability.