I have a multisite setup with two sites...
I now have another domain of tidythetemple.com that I have set to my nameservers and parked in my joeybull cpanel. (I have a reseller hosting account so presume my IP address is dedicated - though I am unsure about the terminology. To me, dedicated means it's for me only and static means it's unchanging. According to the tutorial, dedicated=unchanging?? Anyway, I'm used to viewing websites on the server via IP address before people point their domains at my server.)
I've used the plugin to map tidythetemple.com on to ttt.joeybull.com.
It sort of works, but users of both sites such as admin have to log in on both sites which was not the case before. Any ideas why this may be? If I log in on one site I can see the dashboard for both, but I can't then view the second site without logging in to it.
I have deleted all cookies and reset browser.
Incidentally - I have a holding page plugin ('Coming Soon') active at the moment, but I still have the same problem when I deactivate it.
PS By the way, the tutorial below referred to a lot in by staff in forums says to install in mu-plugins, but the 'usage' page says just plugins. You may want to update the tutorial...