After upgrade to Plesk 12.5 httpd service keeps restarting while accessing the subscription with big amount of domains.
ModSecurity is installed and enabled.
Bug PPPM-3307. It is fixed in Plesk Onyx.
Upgrade to the latest Plesk version.
If upgrade is not possible, replace
/usr/local/psa/admin/sbin/modsecurity_ctl file with attachment and set correct permissions for it:
# chmod 0750 /usr/local/psa/admin/sbin/modsecurity_ctl