I used .htaccess and .htpasswd to restrict the admin folder which is located at root/admin
for that i used the following
.htaccess file
AuthName "Alertalert"
AuthType Basic
AuthUserFile http://alertalert.freetzi.com/admin/.htpasswd
require valid-user
.htpasswd file
rajasekar:$apr1$0yd92n1r$McIxIiQXPRF1u3gRBNRNc1
the .htaccess and .htpasswd file is located inside the admin folder.
When i try to access admin folder, it asks for username and password and thats ok. if I give correct username and password, its not accepting and so prompting again.