@Blankster:
Edit this file:
/etc/sw-cp-server/applications.d/plesk.conf
And change the port number.
Restart sw-cp-server and it's fixed:
/etc/rc.d/init.d/sw-cp-server restart
I guess this will block the automated attacks for now.
Good idea, but if you have SSO or CBM - this port should be changed in database and maybe somewhere else.
But note that officially we recommend you use our best practice.