Hello.
You can disable mod_Security by using .htaccess.
For example, if you have a directory called /phpbb, and want to disable mod_security within that directory, create a .htaccess file within that directory, and put this inside it:
Code:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
PUTTING THIS INSIDE A .HTACCESS FILE IN THE ROOT DIRECTORY WILL DISABLE MOD_SECURITY FOR *EVERYTHING* - SO PLEASE ENSURE TO ONLY PUT IT IN THE DIRECTORY FOR WHICH YOU WANT MOD_SECURITY DISABLED