I previously configured Apache server on Linux to use a password to protect some pages. However, when I tried it on a Mac server, I had a lot of trouble when trying to get it to work. I double-checked the .htaccess file and made sure the syntax was right. I later discovered that the problem was not with the .htaccess file I had. The problem was that the password protection option is turned off by default on Mac. The Apache configuration file is in this directory: /etc/apache2 . I opened up an editor to edit the configuration file httpd.conf and change this line from
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AllowOverride None
to
AllowOverride All
and restarted the Apache web server. It did not work. It took me a while to find the second configuration file that I needed to change. The second configuration files is this one: /etc/apache2/sites/0000_any_80_.conf. After I edited this file to change the AllowOverride option and restarted the web server, the password protection began  to work. By the way, if you are concerned about your web site’s security, you can change the settings to AllowOverride AuthConfig, which provides more restricted features and makes your site safer.

Kudo’s. This is the ONLY piece of literature that solved my problem of adding password protection on OS X Server. Now, what I want to know, is how it can be done directly in httpd.conf as recommended, rather than by using .htaccess files.