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? Error: 413 Request Entity Too Large

Overview

The “413 Request Entity Too Large” error occurs when a client (such as a browser or API client) attempts to upload a file that exceeds the server’s configured size limits. This is commonly encountered during file uploads in WHMCS, such as importing database backups, uploading attachments, or updating modules.

Cause

This error is typically triggered by server-side limitations set in the web server configuration (e.g., NGINX or Apache) or PHP settings that restrict the maximum allowed request size.

Resolution Steps

For NGINX Users

1. Edit the NGINX Configuration File
   Open your NGINX configuration file, usually located at:
   /etc/nginx/nginx.conf
   Or for site-specific settings:
   /etc/nginx/sites-available/yourdomain.conf
2. Increase the client_max_body_size
   Add or modify the following directive inside the http, server, or location block:
   

   client_max_body_size 20M;

   Adjust 20M to the desired maximum upload size.
3. Restart NGINX
   

   sudo systemctl restart nginx

For Apache Users

1. Edit the .htaccess File
   Add the following lines:
   

   php_value upload_max_filesize 20M
   php_value post_max_size 25M

2. Or Edit php.ini (if accessible)
   Locate and modify:
   

   upload_max_filesize = 20M
   post_max_size = 25M

3. Restart Apache
   

   sudo systemctl restart apache2

For WHM/cPanel Users

1. Login to WHM
2. Navigate to: Home » Software » MultiPHP INI Editor
3. Select your domain and adjust:
   • upload_max_filesize
   • post_max_size
4. Save changes and restart Apache if necessary.

Test the Fix

After applying the changes, try uploading the file again in WHMCS. If the issue persists, double-check the configuration and ensure the web server has been restarted.

Additional Tips

• Always back up configuration files before making changes.
• Ensure your PHP version supports the configured limits.
• Consider setting slightly higher limits than needed to avoid future issues.

If you continue to experience issues, please contact your hosting provider or server administrator for further assistance.