This page by David Papkin has links on Server 2012 R2
Step-by-Step: Configure DHCP for Failover
Step-by-Step Guide to Install an Additional Domain Controller by Using IFM
Understand and Deploy DHCP Failover
The revocation function was unable to check revocation
Reset Secure Channel
CMD
netdom reset <machinename> /domain:<domainname>
powershell
Test-ComputerSecurechannel -repair