# How to Enable or Disable ModSecurity in Plesk?

If you find that your website is displaying a **403**, **405**, **406** error, it is very likely that some element of your site is being blocked by a **ModSecurity** rule.

**ModSecurity** is a web application firewall. What it does is block certain requests or code executions that it considers dangerous. You can configure ModSecurity to allow or block certain executions, as required by your website.

In the **Plesk** control panel, you can access the ModSecurity configuration by following these steps:

1. In the main menu of your account within Plesk, go to **Web Application Firewall**.

<figure><img src="/files/akuoWq6JGC0i1kcchmbJ" alt=""><figcaption></figcaption></figure>

2. The first options will allow you to disable or enable ModSecurity or enable it in **detection only** mode. In this mode, it will generate detection logs but will not block the execution of the website.

<figure><img src="/files/YPCcolOt9mrfjIz4X54C" alt=""><figcaption></figcaption></figure>

3. Below, you will find the configuration of the ModSecurity rules. This is an advanced section and should only be configured by the webmaster or specialized technician.
4. Once you have made a change in the ModSecurity configuration, you will need to save the changes by pressing the **OK** button.

<figure><img src="/files/az3xiQNxNJO8BkO6gpGM" alt=""><figcaption></figcaption></figure>


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