Hi,
After several tests, we found a problem with the interworx configuration
I highly recommend everyone to install mod_security2 and take the rules to gotroot.com
edit /etc/php.ini
disable_functions = dl, exec, system, passthru, shell_exec, escapeshellarg, escapeshellcmd, pcntl_exec, c99_buff_prepare, c99_sess_put, popen, pclose, proc_get_status, proc_open, proc_close, proc_nice, proc_terminate, show_source
and change chmod of these directories to 711
/home/user/site.com/html/
/home/user/site.com/
es.
chmod 711 -v /chroot/home/*/*.tld
chmod 711 -v /chroot/home/*/*/html/
bye