Plesk

 Site on Plesk is not available: ModSecurity: Response body too large

  • Dmitry Bystrov

    • Symptoms

    1. Domain is not available with the following error shown:

      500
      external Server Error

    2. The following messages can be found in Domains > example.com > Logs or in /var/www/vhosts/example.com/logs/error.log file:

      [error] [client 203.0.113.2] ModSecurity: Output filter: Response body too large (over limit of 524288, total not specified). [hostname "www.example.com"] [uri "/index.php"] [unique_id "W*****U43-wA*****G"]

    Cause

    Domain exceeded the default SecResponseBodyLimit parameter for ModSecurity (512 Kb).

    Resolution

    For domain

    1. Log in to Plesk.

    2. Navigate to Domains > example.com > Apache & nginx Settings

    3. Add the following line to Additional directives for HTTP and to Additional directives for HTTPS:

      <IfModule mod_security2.c>
      SecResponseBodyLimit 536870912
      </IfModule>

    4. Press Apply .

    Server-wide

    1. Log in to Plesk.

    2. Navigate to Tools & settings > Web Application Firewall (ModSecurity) > Settings > Custom directives section:

    3. Add the following line:

      SecResponseBodyLimit 536870912

    4. Press Apply

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