7 Ways to Fix 404 Errors on WordPress Posts
Over 40% of WordPress site owners encounter a 404 error on at least one post within the first year of managing their site, according to a 2023 survey by WP White Security. The most common cause is a broken permalink structure, and the quickest fix is to simply resave your permalink settings — a 30-second solution that resolves roughly 60% of these errors.
Before you start: back up your site and database
Before making any changes, create a full backup of your WordPress files and database. Use a plugin like UpdraftPlus or manually export via phpMyAdmin. This ensures you can restore your site if a fix goes wrong.
Key takeaways
- The most frequent cause of 404 errors on single posts is a corrupted or misconfigured permalink structure.
- Resetting permalinks is the fastest and most effective first step.
- Plugin conflicts, server-level rewrite rules, and database corruption are common deeper causes.
- Always back up your site before applying any fix.
- Prevent future 404 errors by regularly flushing rewrite rules after any structural change.
Common causes of 404 errors on WordPress posts
- Changes to the permalink structure (e.g., switching from plain to post name).
- Corrupted or missing .htaccess file.
- Caching plugins serving stale rewrite rules.
- Plugin or theme conflicts that interfere with custom post types.
- Server configuration (Apache/Nginx) not allowing rewrite rules.
- Database corruption or missing posts.
1. Why does resetting permalinks fix most 404 errors?
WordPress stores its rewrite rules in the database. When you change your permalink structure, the old rules often persist incorrectly. Resaving the permalink settings forces WordPress to flush those rules and generate fresh ones.
Go to Settings > Permalinks in your WordPress admin. Without changing anything, simply click the Save Changes button. This rewrites the .htaccess file and clears the rewrite cache. Test a post that previously returned a 404 — it should now load correctly.
2. How do I regenerate the .htaccess file to fix 404 errors?
If resetting permalinks didn't work, your .htaccess file may be missing or corrupted. WordPress regenerates it automatically when you save permalinks, but sometimes file permissions prevent writing.
Use an FTP client or your hosting file manager to navigate to your WordPress root directory. Locate the .htaccess file. If it doesn't exist, create a blank file and set permissions to 644. Then go back to Settings > Permalinks and save again. This forces WordPress to write the proper rules into the file.
3. Can clearing caching plugins resolve 404 errors?
Yes. Many caching plugins (e.g., WP Rocket, W3 Total Cache, LiteSpeed Cache) store a static version of your rewrite rules. If those rules become outdated, they serve cached 404 pages even after you fix the underlying issue.
Clear all caches from your caching plugin. In WP Rocket, click Clear Cache. In W3 Total Cache, go to Performance > Empty All Caches. Also clear your browser cache and any CDN cache (like Cloudflare). Then test your post again.
4. How do I check for plugin conflicts causing 404 errors?
Plugins that modify permalinks, custom post types, or redirects can conflict with each other or with your theme. To isolate the culprit, deactivate all plugins and see if the 404 error disappears.
Go to Plugins > Installed Plugins and deactivate every plugin. Then check the broken post. If it loads, reactivate plugins one by one, testing after each activation, until the 404 returns. That plugin is the cause. Look for alternatives or contact the developer.
5. What if the theme's functions.php is causing the issue?
Some themes register custom post types or modify rewrite rules directly in functions.php. If you recently switched themes or updated the theme, these rules may break.
Temporarily switch to a default WordPress theme like Twenty Twenty-Four. If the 404 resolves, your theme is likely the problem. Contact the theme author or review the functions.php file for any addrewriterule or registerposttype code that might conflict.
6. How do I fix 404 errors by flushing rewrite rules via code?
If the admin interface doesn't clear the rules thoroughly, you can flush them programmatically. Add this snippet to your theme's functions.php file or use a plugin like Code Snippets:
function customflushrewrite_rules() {
flushrewriterules();
addaction( 'afterswitchtheme', 'customflushrewriterules' );Save the file and then visit your site's permalink settings page again. This triggers a full rewrite rule flush. Remove the code after testing to avoid performance overhead.
7. Could server-level rewrite rules (Apache/Nginx) be blocking posts?
If your hosting environment uses Nginx, it does not support .htaccess files. Instead, rewrite rules must be added to the Nginx configuration file. Similarly, Apache may have misconfigured AllowOverride directives.
Contact your hosting support and ask them to ensure that AllowOverride All is set for your site's directory (Apache) or that the Nginx config includes a proper try_files directive. A typical Nginx rule for WordPress is:
location / {
try_files $uri $uri/ /index.php?$args;
}This tells Nginx to route all requests through WordPress's index.php, enabling the permalink system.
8. How do I repair the WordPress database to fix 404 errors?
Database corruption can cause posts to become inaccessible, returning a 404 even though the post exists. WordPress includes a built-in database repair tool.
Add the following line to your wp-config.php file, just before the / That's all, stop editing! / line:
define('WPALLOWREPAIR', true);Then visit https://yoursite.com/wp-admin/maint/repair.php. Click Repair Database. After the process finishes, remove that line from wp-config.php for security.
9. What if the post itself is missing or deleted?
A 404 error can occur if the post was accidentally deleted, moved to trash, or its slug was changed without a redirect. Check Posts > All Posts and look for the post in Trash. If it's there, restore it. If it's gone, you may need to recover from a backup.
For posts that exist but have a changed slug, install a redirect plugin like Redirection and create a 301 redirect from the old URL to the new one. This prevents visitors from seeing a 404.
Comparison table: quick reference for 404 fixes
| Fix Method | Difficulty | Time to Apply | Effectiveness |
|---|---|---|---|
| Reset Permalinks | Easy | 30 seconds | High (60% of cases) |
| Regenerate .htaccess | Easy | 2 minutes | Medium |
| Clear Caching | Easy | 1 minute | Medium |
| Disable Plugins | Medium | 5–10 minutes | High |
| Switch Theme | Medium | 5 minutes | High |
| Flush Rewrite Rules (code) | Medium | 2 minutes | High |
| Server Config (Apache/Nginx) | Hard | Varies | High |
| Database Repair | Medium | 5 minutes | Medium |
How to prevent 404 errors on WordPress posts
Regularly flush rewrite rules after any change to permalinks, custom post types, or themes. Use a plugin like Permalink Manager to keep track of slug changes. Always create a staging site before making major updates. And if you automate content publishing, ensure your platform respects rewrite rules.
Once your site is healthy and free of 404 errors, you can focus on creating content. nativeWP helps you publish SEO-optimized articles on autopilot, so you never have to worry about broken links slowing down your growth.
Frequently asked questions
Why do I get a 404 error only on specific WordPress posts?
This usually happens when the post's permalink slug was changed, the post was moved to trash, or a plugin/theme conflict affects only that post type. Check the post's URL slug and ensure it hasn't been altered.
Can a 404 error affect my SEO?
Yes. Google treats 404 errors as broken links, which can harm your site's crawl efficiency and user experience. If the page had backlinks, you lose that link equity. Always redirect deleted posts to a relevant page.
Do I need technical skills to fix 404 errors?
Most fixes require basic WordPress admin access. Only server-level fixes (Nginx/Apache) or database repairs may need more technical knowledge. Follow the steps in order from easiest to hardest.
What if resetting permalinks doesn't work?
Move to the next fixes: check .htaccess, disable plugins, switch theme, or flush rewrite rules via code. The problem is likely deeper — possibly a server misconfiguration or database corruption.
Should I use a plugin to manage 404 errors?
For ongoing prevention, a plugin like Redirection or SEO Framework can log 404 hits and let you create redirects. However, fixing the root cause is always better than masking it with redirects.