You have managed to lock yourself out of the WHM interface – but still have SSH to your server. You need to clear the IP address out of the black listed IPs
This will clear all banned IPs
mysql connect cphulkd delete from brutes; delete from logins;
You can see a list of locked IPs using these commands
select IP, BRUTETIME from brutes order by BRUTETIME; select IP, LOGINTIME FROM logins order by LOGINTIME;
There is some more conversation on the source site.