Getting the following error while accessing WHM:
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This account is currently locked out because a brute force attempt was detected. Please wait 10 minutes and try again. Attempting to login again will only increase this delay. If you frequently experience this problem, we recommend having your username changed to something less generic.
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Reason:

cphulkd: It is Cpanel Brute Force Protection service.This service monitors failed authentication attempts and locks out accounts after the threshold is met.

Remedy:

To re-enable your account, login via ssh and disable cphulkd using the command below.

/usr/local/cpanel/bin/cphulk_pam_ctl –disable

This should allow you to login to WHM and double check your cphulk settings.

Go to WHM -> Security -> Security Center -> cPHulk Brute Force Protection

Flush DB will remove all blocked IPs:

OR

Login as root

[root@server:] mysql

mysql> use cphulkd;

mysql>BACKUP TABLE brutes TO ‘/path/to/backup/directory’;

mysql> SELECT * FROM brutes WHERE `IP`=’xxx.xxx.xxx.xxx’;

mysql> DELETE FROM brutes WHERE `IP`=’xxx.xxx.xxx.xxx’;

mysql>quit