Top WordPress Errors and How to Fix Them in 2025

WordPress powers over 43% of all websites on the internet. That widespread adoption comes with a trade-off: when something breaks, it can feel overwhelming, especially when the error message gives you almost no useful information.

The good news is that most WordPress errors follow predictable patterns. Once you know what causes them and where to look, fixing them becomes far less stressful. This guide covers the most common WordPress errors site owners run into in 2025, along with clear, actionable steps to resolve each one.

Before you attempt any fix, make sure you have a full backup of your site. A complete backup of your files and database gives you a safety net in case anything goes wrong during troubleshooting.

1. 500 Internal Server Error

The 500 Internal Server Error is one of the most frustrating problems you can encounter on a WordPress site. The server tried to load your page and failed — but the error message gives you no clue about the actual cause.

What causes it:

• Corrupted .htaccess file (especially after permalink or plugin updates)
• Plugin or theme conflict following a bad update
• PHP memory limit being exhausted
• Incompatible PHP version (such as PHP 8.x breaking older plugin code)
• Server misconfiguration

How to fix it:

Start with the .htaccess file. Connect to your site via FTP, navigate to the root directory, and rename .htaccess to .htaccess_old. Reload your site. If it works, go to Settings > Permalinks in your WordPress dashboard and click Save Changes to generate a fresh .htaccess file.

If that does not resolve it, deactivate all plugins by renaming the /wp-content/plugins folder to plugins_old via FTP. If your site loads, rename the folder back and reactivate plugins one by one until you find the conflict.

Finally, if neither step works, increase your PHP memory limit by adding this line to wp-config.php before the “That’s all, stop editing!” comment:

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

2. White Screen of Death (WSoD)

The White Screen of Death is exactly what it sounds like — a completely blank screen with no error message. It is one of the most puzzling problems for beginners because there is nothing to read or act on.

What causes it:

• Plugin or theme conflict
• Exhausted PHP memory limit
• Corrupted WordPress core files

How to fix it:

First, check whether the issue is site-wide or limited to one page. If it affects only the front end, try accessing your wp-admin. If you can log in, start by deactivating all plugins.

If you cannot access wp-admin, connect via FTP and rename /wp-content/plugins to plugins_old. Test your site. If it loads, rename the folder back and reactivate plugins individually.

Next, switch to a default WordPress theme by renaming your active theme folder inside /wp-content/themes. WordPress will automatically fall back to a default theme.

If the screen is still blank, enable WordPress debug mode by adding these lines to wp-config.php:

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

This writes errors to a debug.log file in wp-content, giving you a clear starting point for further investigation.

3. Error Establishing a Database Connection

This error means WordPress cannot connect to your MySQL database, so nothing on your site loads — not the front end, not the dashboard.

What causes it:

• Incorrect database credentials in wp-config.php
• Database server is down or unresponsive
• The database has hit its storage quota and been shut down by the host

How to fix it:

Open wp-config.php via FTP and verify that the following values are correct: DB_NAME, DB_USER, DB_PASSWORD, and DB_HOST. These credentials need to match exactly what your hosting account has set up for the database.

If the credentials are correct, try resetting your MySQL password through your hosting control panel and updating the value in wp-config.php accordingly.

If neither fix works, contact your hosting provider. The database server may be down, or your database may have exceeded its allocated storage limit.

4. WordPress 404 Error

A 404 error appears when a visitor tries to access a page that WordPress cannot find. While this is one of the less severe errors, it still creates a frustrating experience for users and can hurt your site’s SEO over time.

What causes it:

• Broken or incorrect permalinks settings
• A corrupted or missing .htaccess file
• A page or post that has been deleted or its URL changed

How to fix it:

The most common fix is to refresh your permalink structure. Go to Settings > Permalinks in your WordPress dashboard and click Save Changes without changing anything. This regenerates the .htaccess file and resolves most 404 issues.

If the error persists, check the URL in question for typos. Also clear your browser cache and any WordPress caching plugins, as cached redirects can cause ghost 404 errors even after a fix is applied.

5. 403 Forbidden Error

A 403 error means the server understands the request but refuses to fulfill it. Your visitor (or you) is being blocked from accessing a page or resource.

What causes it:

• Incorrect file permissions
• A corrupted or overly restrictive .htaccess file
• A security plugin blocking access
• CDN or hotlink protection misconfiguration

How to fix it:

Start by generating a new .htaccess file. Go to Settings > Permalinks and click Save Changes. This is often enough to clear a permissions-related block.

If that does not work, check your file permissions via FTP or your hosting file manager. Folders should be set to 755 and files to 644. Incorrect permissions are a common cause of 403 errors, particularly after migrations.

If you have a security plugin installed, temporarily deactivate it and test again. Some security plugins apply aggressive access rules that block legitimate requests.

6. WordPress Memory Exhausted Error

This error appears when a PHP script running on your site exceeds the memory limit allocated by your server. You will typically see a message like: Fatal error: Allowed memory size of X bytes exhausted.

What causes it:

• A resource-heavy or poorly coded plugin
• Running too many plugins simultaneously
• A PHP process trying to handle more data than allowed

How to fix it:

The quickest fix is to increase the PHP memory limit. Open wp-config.php and add this line before the “That’s all, stop editing!” comment:

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

If that does not help, try raising it to 512M. If you are still hitting the limit after that, contact your hosting provider — your current plan may not have enough resources for your site’s requirements.

Also review your active plugins. Deactivate any plugins you are not actively using and delete unused themes, as these can contribute to memory overhead even when not running.

7. WordPress Stuck in Maintenance Mode

When WordPress runs an update, it creates a .maintenance file in the root directory and displays a “Briefly unavailable for scheduled maintenance” message. Normally this disappears once the update finishes. When an update fails midway, the file stays in place and your site stays locked in maintenance mode.

What causes it:

• A plugin, theme, or core update that failed or was interrupted
• A server timeout during the update process

How to fix it:

Connect to your site via FTP or your hosting file manager. Look for a file named .maintenance in the root directory of your WordPress installation. Delete it. Your site will immediately come back online.

After restoring access, go to your dashboard and check which update failed. Try running it again manually or upload the plugin/theme ZIP file directly via Plugins > Add New.

8. WordPress Not Sending Emails

If your WordPress site is not sending password reset emails, order confirmations, or contact form notifications, the issue is almost always with how WordPress handles outgoing mail — not with your email address itself.

What causes it:

• WordPress uses the PHP mail() function by default, which many hosting providers block or flag as spam
• No SMTP configuration in place
• Incorrect From address settings

How to fix it:

Install a dedicated SMTP plugin such as WP Mail SMTP. This plugin routes all outgoing WordPress emails through a proper mail server (like Gmail, SendGrid, Mailgun, or your hosting’s SMTP) instead of relying on PHP mail.

Configure the plugin with your SMTP credentials, run the test email feature to confirm delivery, and check your spam folder if test emails do not arrive in your inbox immediately.

9. Failed to Upload Image / HTTP Image Upload Error

This error appears when you try to upload an image or file through the WordPress media library and the upload fails with an HTTP error.

What causes it:

• PHP memory limit too low
• File size exceeds the server’s upload limit
• Incorrect file or folder permissions on the uploads directory
• A browser-side issue or extension conflict

How to fix it:

First, try a different browser or disable browser extensions to rule out a client-side issue.

If the error persists, increase the PHP memory limit as described in the Memory Exhausted section above. Also check that your /wp-content/uploads folder has 755 permissions.

To increase the file upload size limit, add this to your php.ini file:

upload_max_filesize = 64M
post_max_size = 64M

If you do not have access to php.ini, add the equivalent values to your .htaccess file or contact your host to adjust server-level limits.

10. WordPress Redirect Loop (ERR_TOO_MANY_REDIRECTS)

A redirect loop happens when your site keeps bouncing visitors between URLs endlessly until the browser gives up and shows an error. This is a particularly common issue on sites that have recently moved from HTTP to HTTPS.

What causes it:

• Conflicting redirect rules in .htaccess and a plugin (or CDN) both trying to force HTTPS
• Incorrect WordPress Address (URL) or Site Address (URL) settings
• CDN or WAF forcing redirects that conflict with server-level rules

How to fix it:

Go to Settings > General in your WordPress dashboard and confirm that both the WordPress Address and Site Address match exactly — same protocol (http or https), same domain, no trailing slash differences.

Next, clear all caches — your caching plugin, browser cache, and CDN cache — before retesting.

If the loop persists, temporarily deactivate all plugins and disable your CDN. Re-enable them one at a time to identify the conflicting redirect rule. Check your .htaccess file for duplicate or conflicting redirect directives.

11. WordPress 502 and 503 Errors

A 502 Bad Gateway and 503 Service Unavailable error both indicate that your server is having trouble processing requests — though for slightly different reasons.

A 502 error means your server received an invalid response from an upstream server. A 503 error means your server is temporarily unavailable, often due to high traffic, maintenance, or resource exhaustion.

How to fix them:

For both errors, start by deactivating your plugins and switching to a default theme. If either step restores access, you have a plugin or theme conflict to investigate.

Also disable your CDN temporarily and test your origin server directly. For 503 errors specifically, check whether your server’s resources (CPU, memory, disk space) are being maxed out — a sign that you may need to upgrade your hosting plan or optimize resource-heavy plugins.

12. WordPress Syntax Error

A syntax error typically appears after you have manually edited a PHP file — a theme’s functions.php, a plugin file, or wp-config.php — and introduced a mistake in the code.

You will usually see something like: Parse error: syntax error, unexpected token on line X.

What causes it:

• A missing semicolon, bracket, or quotation mark in edited PHP code
• Code copied from a source that used incorrect quote characters (curly quotes instead of straight quotes)

How to fix it:

Connect via FTP and open the file referenced in the error message. Go to the exact line number mentioned and look for the syntax mistake. Common issues include a missing ; at the end of a statement, an unclosed { bracket, or mismatched quote characters.

If you recently pasted code from a blog post or Word document, the quotes may have been converted to typographic (curly) quotes. Replace them with standard straight quotes manually.

General WordPress Troubleshooting Tips

No matter what error you encounter, these steps apply universally:

Always back up first. Before making any changes, run a full backup of your files and database. Plugins like UpdraftPlus or Duplicator handle this quickly.

Use WordPress debug mode. Adding define('WP_DEBUG', true); to wp-config.php activates detailed error logging that can pinpoint the exact cause of most problems.

Test plugins one by one. Plugin conflicts are behind a large percentage of WordPress errors. Deactivating them individually is the fastest way to find the culprit.

Switch to a default theme. If deactivating plugins does not resolve the issue, switch temporarily to a default WordPress theme (Twenty Twenty-Five) to rule out theme-related causes.

Contact your host. Some errors — database downtime, server resource limits, PHP version mismatches — can only be resolved at the server level. Your hosting provider’s support team is your best resource for these.

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Final Thoughts

WordPress errors can feel alarming when they first appear, but the vast majority of them have straightforward fixes. The errors covered in this guide account for most of what site owners run into in day-to-day WordPress management.

Keep your plugins, themes, and WordPress core updated. Maintain regular backups. And the next time something breaks, work through the steps methodically — most of the time, the fix is simpler than the error message suggests.