This can be a very effective way to protect your Joomla! administrator directory. Any other directory in public_html can be protected in the same way. This method only works if you have a static IP address assigned to you. Anyone attempting to browse such directories using a different IP Address will get a 403 Forbidden error.

Directions

1. In the directory you wish to protect, open (or create) a file called, .htaccess. (Note the dot at the beginning of the file name.)
2. Add the following code to this file, replacing 100.100.100.100 in this example with the static IP address you plan to allow:

Order Deny,Allow Deny from all Allow from 100.100.100.100 

• Optional: You can enter partial IP Addresses, such as, 100.100.100. This allows access to a range of addresses.

• Optional: You can add multiple addresses by separating them with comma's.

100.100.100.101, 100.100.100.102