I did a fresh installation of WordPress 3.3. The primary domain that I installed was http://www.<domain>.net. I installed WordPress to http://www.<domain>.net/wordpress. I downloaded the wp-donfig.php file, took a backup of the file and added the following line as instructed:
I then saved the file and uploaded it. I reloaded the site and the Network Setup was now available. However, I received an error of:
ERROR: Your WordPress address must match your Site address before creating a Network. See General Settings.
I went to General Settings and changed the WordPress Address (URL) to match the domain, http://www.<domain>.net.
Thinking that I need to restore the wp-config.php file, but don't want to make it any worse.