This is for sub-domain installs
Here at Frothy Goodness we use Media Temple servers for most of our Hosting needs. We’ve been extremely happy, but ran into a couple issues installing WordPress Multisite for a client. Here is how we got it working:
*We recommend backing up
1.) Open the Terminal on Mac.
2.) Type: ssh firstname.lastname@example.org
3.) Enter your root password
4.) Type: cd /var/www/vhosts/yourdomain.com/conf
5.) Type: vi httpd.include
6.) Go into insert mode type: i
7.) Find: ServerAlias http://www.yourdomain.com
8.) Change to: ServerAlias *.yourdomain.com
9.) Press escape to exit insert mode
10.) Type :wq then enter to go back to the main terminal
11.) Restart apache: service httpd restart
12.) Once Apache restarts your done!