That is a newer feature of Tableau Server and it does look like it is being implemented properly but since the server won't start up after implementing it, this might be time to open a case with Tableau Technical Support for further investigation: http://www.tableau.com/support/request They'll probably want copies of your Tableau Server along with the date and time the Tableau Server failed to start up.
If you end up finding out the answer, we'd love to hear what was necessary to fix the issue.
Hope this helps!
Basically I tried a couple of times untill it worked.
Not really a fix, just a brute force attempt of getting it to do what I needed :-D