How to Fix 501 Not Implemented Error in WordPress

How to Fix 501 Not Implemented Error in WordPress

Getting a “501 Not Implemented” error on your WordPress website? This server-side error means the server doesn’t recognize or support the request method used by your browser or app. It's less common than other HTTP errors, but when it shows up, it can break your site entirely.

Let’s walk through how to troubleshoot and fix this issue using WordPress and cPanel.

What Causes a 501 Not Implemented Error?

- Unsupported or malformed browser request methods
- Web server configuration issues (Apache, NGINX)
- Security/firewall blocking specific requests
- Corrupted .htaccess file or rewrite rules
- Hosting misconfigurations or limitations

Step-by-Step: How to Fix the 501 Error

1. Clear Browser Cache and Try a Different Browser

Sometimes, the error is temporary or browser-specific.

- Clear your cache and cookies
- Try accessing your site in another browser or device

2. Check the .htaccess File

A misconfigured .htaccess file can cause unsupported request behavior.

- Log in to cPanel > File Manager > public_html
- Locate and rename the .htaccess file to .htaccess_old
- Refresh your site

If it works, regenerate the file by going to WordPress Dashboard > Settings > Permalinks > Save Changes

3. Disable Plugins Temporarily

A plugin may be sending unusual or unsupported HTTP requests.

- Go to wp-content/plugins via File Manager
- Rename the “plugins” folder to “plugins_old”
- Reload your website

If it works, one of your plugins is the issue. Rename the folder back and deactivate plugins one by one to identify the cause.

4. Switch to a Default Theme

Like plugins, themes can introduce server-side issues.

- Go to wp-content/themes
- Rename your active theme folder (e.g., hello-elementor to hello-elementor_old)
- WordPress will revert to a default theme

Check if the error resolves.

5. Check Server Logs

Server logs often hold more details.

- In cPanel, go to Metrics > Errors
- Look for recent entries around the time you saw the 501 error

These logs can point you to the exact file or process that triggered the error.

6. Contact Your Hosting Provider

If none of the above works, it could be a server issue beyond your control.

- Contact your web hosting provider
- Ask them to check for mod_security rules, unsupported methods, or disabled server features

You may need to upgrade to a host that supports your configuration.

Final Thoughts

The 501 Not Implemented error is usually related to server misconfiguration or unsupported request methods. With a few simple cPanel and WordPress steps, you can quickly rule out site-level causes and request help from your host if needed.

Supercharge Your Hosting Experience with RDPCore.com

At RDPCore.com, we provide:

- Stable and secure WordPress hosting with full cPanel access
- Support for all major HTTP request types and server modules
- 24/7 expert support to resolve hosting and error issues
- Auto-healing and error-monitoring systems to reduce downtime

Get reliable hosting and fewer errors—visit https://rdpcore.com today!