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Managing ModSecurity to Prevent 412 Errors

How to Manage ModSecurity to Prevent 412 Errors

Managing ModSecurity to Prevent 412 Errors

ModSecurity is a web application firewall designed to protect your site from common web attacks such as SQL injection and cross-site scripting. However, sometimes ModSecurity can mistakenly block legitimate requests, leading to errors like the 412 Error. In this article, we'll show you how to manage ModSecurity and disable rules that might cause false positives.

412 Error: Your request was filtered out due to possible security issues. This happens when ModSecurity detects suspicious parameters in your request.

What is ModSecurity?

ModSecurity is a firewall for web applications that analyzes incoming HTTP requests and responses. If a request triggers any of its security rules, such as those for SQL injection, it blocks the request and returns an error. To ensure your website's proper functioning, it's important to configure ModSecurity correctly.

Common ModSecurity Rules

  • SQL Injection Protection
  • Cross-site Scripting (XSS) Protection
  • Command Injection Protection
  • File Inclusion Attack Protection

How to Disable ModSecurity Rules

If you encounter frequent errors like the 412 error, you can disable specific ModSecurity rules that are causing the problem. Here's how:

  1. Open your hosting control panel and navigate to Advanced → ModSecurity.
  2. Check the Attack Stats and identify the rule ID causing the issue. For example, a login attempt error may show [id=900011].
  3. Edit your site's .htaccess file and add the following code to disable the problematic rule:
<IfModule mod_security2.c>
SecRuleRemoveById 900011
</IfModule>

Repeat these steps for any rule you wish to disable.

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