This is with Active Directory Federation Services / ADFS / "AD FS" 2012 R2.
Server sometimes hangs during restart.
What I find is that the server is up but the ADFS wizard will not start. It says that the ADFS service is not running. So restart the ADFS service.
Bad idea! Service just sits there saying "Starting". Can't Stop / Restart etc.
So reset the server. Takes a while to come up.
Before starting the ADFS service, start the “Microsoft Key Distribution
Service” and then start the ADFS service and then start the ADFS wizard.
Some more possibly useful information here.