I have tried it in Magento root
AuthUserFile /home/username/public_html/.htpsswd
AuthType Basic
AuthName "restricted area"
<files "index.php" >
Require valid-user
</files>
I tried to protect access index.php file by .htaccess file by above code
I find base path on AuthUserFile by php code
<?php
echo getcwd();
?>
Here's my .htpsswd file
admin:admin
Everytime I enter password it show popup which ask for password again and again
work perfect, it was mistake in file name (spelling) ..