Recently I have been updating certificates on an RDS 2012 R2 farm.  I created the cert and applied it.  It all looked good and I thought I was done.  However, When a user tried it they cert errors.

When I logged back into the RDS console I could see that I made a mistake, I had applied the cert to the Connection Broker, but I hadn’t applied it to any of the other roles.  

Once i have applied it to the other roles, it sprung back into life.