After running a Plesk security check in the watchdog module, I see a message similar to the following: Your system contains some unknown version numbers. Please run Rootkit Hunter with the --update parameter or fill in the contact form (www.rootkit.nl).
Rootkit Hunter found new package versions that are not listed in its database.
Rootkit Hunter usually updates the database automatically. You can force the update with the following command:
[$PRODUCT_ROOT_D](/en/952)/admin/sbin/modules/watchdog/rkhunter --configfile [$PRODUCT_ROOT_D](/en/952)/etc/modules/watchdog/rkhunter.conf --update
Before executing the command above, replace $PRODUCT_ROOT_D with /usr/local/psa or /opt/psa. You may get the value of the variable $PRODUCT_ROOT_D in the file /etc/psa/psa.conf on your server.