I have an SBS2008 as my DC and a new WS2012 as a member. I noticed a few days ago that when I shut down my SBS, I was not able to login (rdp) to WS2012 (complaint about my username/pass), I had to bring the SBS2008 up and was able to rdp to 2012 again. I would assume it would cache the login details. What if my SBS dies? Will not be able to connect to the other server at all?