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Knowledge Base

Unable to log into webmail under specific user: Response body too large

 
firewallgohttpsinternal server errormail

Symptoms

  • In an attempt to log into Roundcube webmail under specific user, it fails with the error:

    external server error

  • At the same time the following can be found in /var/log/httpd/error_log or /var/log/modsec_audit.log log file:

    [:error][client 203.0.113.2] ModSecurity: Output filter: Response body too large (over limit of 524288, total not specified). [hostname "webmail.example.com"] [uri "/roundcube/index.php"] [unique_id "XvMRFl1Q0bEa9Qiy1@TmewAAAEU"], referer: https://webmail.example.com/roundcube/?_task=mail&_mbox=INBOX

Cause

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

Resolution

  1. Log in to Plesk.

  2. Go to Tools & settings > Web Application Firewall (ModSecurity) > Settings.

  3. Add the following line into the Custom directives section:

    SecResponseBodyLimit 546870912

  4. Scroll down and press the OK button to apply the changes.

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