1. SSH to your server as root and execute mysql from command line
[root@server ~]# mysql
2. From mysql interface type as follows:
mysql> use cphulkd; mysql> select IP, BRUTETIME from brutes order by BRUTETIME; mysql> select IP, LOGINTIME FROM logins order by LOGINTIME;
The above commands shows the brute force login attempt with IPs and time. After that use the below command on shell and remove the IP.
mysql> delete from brutes; mysql> delete from logins;
Now, You can login into your server via WHM/cPanel.