For Joomla, we should chmod all folders to 755 and files to 644. (Of course, there are some folders we need to chmod 777…).

With FileZilla, right click on the Joomla folder, choose File Permissions…

• “Recurse into subdirectories”  CHMOD for all subfolders.
• “Apply to all files and directories” CHMOD files + Folders.
• “Apply to files only” CHMOD files only.
• “Apply to directories only”  CHMOD for folders only.

If your host is support, you can create a chmod.php file with content:

<?php

system(‘find . -type d -exec chmod 755 {} ; 2>&1′);
system(‘find . -type f -exec chmod 644 {} ; 2>&1′);

echo(“nnComplete!”);

?>

Then upload it to the folder you want to chmod and view it (yoursite/chmod.php), it will chmod  all subfolders to 755 and files to 644.