awstats web authentication not working

I have disabled anonymous user on the stats virtual directory in the panel, When I access stats link  it prompt for the login but the problem is it don't accept the webadmin user login.
Even I am able to access HC panel with same credentials.
My question is where HC set the stats authentication so I could verify the password entry there ?

If you have changed the webadmin user password then there is a chance the password is not updated in .htpasswd file.

Go to /webspace/reseller/webadmin/domain.com
Rename or remove existing .htpasswd file
and excute following command
htpasswd -cb webusers_domain.com.htpasswd webadmin webadmin-password