I have just completed a clean cPanel install of 3.8.1 and run through the enable multi site process, all OK created my sites and they work great, the sites are
I can modify and administer them both via the /wp-admin/ url OK.
I then added narf.domain.com.au to my multisite, added then DNS records and now I can see the site at narf.domain.com.au - content shows up great and functionality looks OK.
When I navigate to the narf.domain.com.au/wp-admin/ to configure the site I get the login screen and get stuck in a loop with the error message "ERROR: Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress."
Doing some research I am guessing its a cross site cookie issue, anyone have a solution to allow login in the additional domain ? I have several others to add in the future as well.
This is my first WordPress install, please treat me like I'm 5 :)