Caro,
Com relação ao AuthType, ele esta configurado, olha so a minha directory

<Directory /var/www/dspam>
Addhandler cgi-script .cgi
Options +ExecCGI -Indexes
DirectoryIndex dspam.cgi

# Note: you have to add www-data to the 'shadow'
# group to make this work. You whould
# better change for another authentication bakend
#AuthPAM_Enabled on

AuthType Basic
AllowOverride None
AuthName "DSPAM Administration"
AuthUserFile /var/www/dspam/htpasswd.users
Require valid-user
</Directory>