vps account overloading

Hello

I have VPS account and my account is overloaded last 3-4 days.
i get few emails from Cpanel

Code:
------
This is cPanel stats runner on host.*****.net!
While processing the log files for user mydrugn, the cpu has been
maxed out for more than a 6 hour period. The current load/uptime line on the server at the time of
this email is
15:13:28 up 40 days, 3:24, 0 users, load average: 13.20, 12.81, 12.60
You should check the server to see why the load is so high and take
steps to lower the load. If you want stats to continue to run even with a high load; Edit
/var/cpanel/cpanel.config and change extracpus to a number larger then 0 (run
/usr/local/cpanel/startup afterwards to pickup the changes).
check Main >> Server Status >> CPU/Memory/MySQL Usage

and view that starting 04.06.2006 (everyday) somebody is eating my server resources

op Process %CPU 68.4 proftpd: ftp - 216.55.162.181: anonymous/Kgpuser@home.com: IDLE
Top Process %CPU 68.0 proftpd: ftp - 216.55.162.181: anonymous/Kgpuser@home.com: IDLE
Top Process %CPU 67.9 proftpd: ftp - 216.55.162.181: anonymous/Kgpuser@home.com: IDLE
i don't give anybody anonymous access and don't have such user

few questions
1. what is proftpd , why it can cause server overloading
2. what do you think, clossing access from this ip can resolve problem?

thank you

 

 

 

 

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