vi /etc/cobbler/modules.conf

 [[authentication]]
 module = authn_configfile

 [[authorization]]
 module = authz_allowall


Change password for cobbler username

htdigest /etc/cobbler/users.digest "Cobbler" cobbler


Restart the service

service cobblerd restart
service httpd restart


Access in browser

https://<server_name_or_ip>/cobbler_web