Unable to attach files in a WebMail or any file upload when ModSecurity is

[Suhitha]

Question: Unable to attach files in a WebMail or any file upload when ModSecurity is active: An error occurred! File upload failed

Applicable to:

• Plesk for Linux

Symptoms

• Unable to attach files bigger than 15MB in webmail with following error:

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An error occurred! File upload failed


• Drag and drop file into webmail body message fails with following error:

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Server error! (Request Entity Too Large)

• Unable to attach big files to the website forms with the error below:

• Connection to the server failed

• Following error message is shown in Apache log file:

# tail -f /var/log/httpd/error_log
[:error] ModSecurity: Request body (Content-Length) is larger than the configured limit (13107200). [hostname "webmail.example.com"] [uri "/"] [unique_id "Wvm2-f069f312c27e"], referer: http://webmail.example.com/?_task=mail&_action=compose&_id=123456789abcdefgh

• ModSecurity SecRequestBodyLimit parameter is set as follows:

# egrep -Ri SecRequestBodyLimit /etc/httpd/conf.d/mod_security.conf
SecRequestBodyLimit 13107200


Cause

Upload file process fails because ModSecurity SecRequestBodyLimit is reached.


Resolution

1.Log in to Plesk

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

3.Add the following line into the text field Custom directives:

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SecRequestBodyLimit 67108864
4.Press Apply